I want to be clear, it was a terrible loss and even worse given the circumstances. Lot of guys sucked.
But if you're going from "they are winning the Finals" to "they aren't anymore" because of one single regular season game, then I'm sorry I just can't take you seriously. It's the middle of the season and close to the All-Star break. Even the great teams in history have a game or two like this during the season and sometimes sleepwalk a few games. The C's have still mostly taken care of business and have the best record in the NBA and a 5-game lead for the 1 seed in the East.
Obviously if they have another bad week with a few blowout losses mixed in, I'll become concerned. Not now though. Yes, some of the things we've seen the last week are similar to what we've seen in recent years, BUT this is a new team and the playoffs are still a few months away. The playoffs are where this team will truly be judged but even if we had won yesterday, we'd say the same thing.
If you suddenly think they aren't a Finals-caliber team just because of one single week, then you never really believed in them to begin with. They are on pace for 60+ wins. 60 wins still means 22 losses during the regular season, and guys sit out some games too. They won't be perfect every game. The 2008 team finished 66-16, which again, that's 16 losses they had and I remember a few of them being ugly too.
I just think these guys aren't winners. They lack that killer instinct that separates the Jordans from the Durants. The Bradys from the Philip Rivers's.
It's hard to win without that gene.
It's probably more like Joe Montana vs Jim Kelly...because they've been to the playoffs multiple times, been to the ECF multiple times, they just haven't gotten over that hump.
That said, I think we might be placing too much credence on a regular season loss to a team of no hopers that just happen to be our historical hated foes. As @Kernewek mentioned above, losing sucks and whenever we lose everyone's in a bad mood and all the doubts come out, which is why (as @liam said) threads after losses are twice as long as after wins. The forum is never busier than after losses, even more so this year that we just haven't had that many losses to be able to complain about the things we're unhappy about. There's definitely things to complain about - continued reliance on the 3s going in the hoop, inability to adapt when the ball (usually 3s) isn't going through the hoop, the prevalence of their sets that try to create open 3 point shots at the expense of 2 point shots, turning the ball over.
But to me the biggest thing that differentiates the Jays and this team from other championship teams and players (like Jordan, Kobe, KG, etc) is that those guys wanted to win ALL THE TIME. Even in some meaningless game against some no hopers from the G-league, you never felt that they took nights off. I'm sure they did but the perception is they were locked in, every single night, all 82 games of the regular season and every single game of the playoffs, for years in a row. THEY NEVER TOOK NIGHTS OFF. Conversely, these guys take nights off, there are times when it feels like they're just going thru the motions, and (maybe this is just their personalities are more passive) but you don't feel they feel the anger from fans at their performances, and that makes us angrier at them.
I think as fans we can accept losing (some of us anyway), especially if it's too a good team (though from the reactions to the Denver game there are some that can't accept that either), but most of us don't want to lose to a bad team, and we ESPECIALLY don't want to lose to a historical rival who is currently one of the also-rans in the West who were missing their top two players, and we REALLY REALLY don't want to lose where it looks like the team didn't give a stuff and didn't put the effort in and basically mailed it in and even when they lost they still probably don't care because it's the middle of the season, near the All-Star break, it's to a team that's probably going to struggle to even make the playoffs and are no threat to them and if they took a night off and lost well so what? So they suffered a humiliating loss, in the overall scheme of things it probably doesn't matter, after the next game is won and the fans are happy again. That's how they probably feel. They still feel like they have a great chance at the championship even after this loss.
And so do I...I'm less upset about their chances, I still think we have as good a chance as the other contenders at bringing home the banner. But I never thought they would go 82-0, I don't think they're anywhere near as good as they think they are, and I just don't think the Jays are the types of players that have that Jordan gene where they just can't bear to lose even in meaningless games. I think when the games are meaningful they will be switched on and there won't be the lack of effort issue we saw last night, but they're just the types of players that will take mental time off during the season and suffer these types of losses. And yes it's disappointing but I think that's who they are. That's the drive that I think they don't have - the drive to win every game, to bury the opposition. I fear we will see more of these types of "switched off" losses as we head to the playoffs because these guys just get bored I think.