The two teams that blew out the Sixers were the Raptors and the Mavericks. Those teams are both widely praised as being contenders. You are being completely dishonest if you are saying those teams are "some of the worst in the NBA." That's not up for debate; you're simply off-base and laughably wrong.
That said, they lost relatively competitive games to the Bulls, the Rockets, and the Heat -- three teams that are all projected as playoff squads, and in the case of the Bulls, are widely viewed as Eastern Conference Finalists. They also lost games to the Magic, the Bucks, and the current-day Pacers. Are those three among the worst in the league? Sure, I guess. The Magic have a bunch of losses, but they've played every single one of their opponents super close. The Bucks grossly underperformed largely last season due to injuries. The Pacers? They're Dr. Jekyll and Mr. Hyde. They'll lose to the Celtics one day and beat the Heat the next day. What do I take from those losses? Any team can lose to any other team. Whoopty-doo. The Celtics lost to a hobbled OKC squad after holding a 15-point lead, yet I don't see you bringing that up.
And am I supposed to look at their opponent's injuries and somehow view the Sixers' losses as even worse? Their starting point guard and reigning Rookie of the Year was missing for all those games save for yesterday's. However, I guess that's not relevant, but the fact that team X was missing player Y must be brought up because how DARE the Sixers (without MCW) lose to another bad team that happens to be missing player Y?
I don't really get entirely what you are saying here. Are these all instances of a team being dominated from start to finish? Why are the Mavericks and Jazz mentioned? The clippers got completely thumped by Golden State, should they be on this weird random list?
Yes, those are all teams getting dominated from start to finish. No, there's no difference between the Clippers getting "completely thumped by Golden State" and the Sixers getting dominated by the Mavericks and the Raptors. All three of the teams that won are good.