I don't think this will haunt Marcus at all. It will be forgotten quickly and likely only mentioned next time we play the Spurs, MAYBE. He's a kid and whether it was intentional or not, it's forgivable. It's not like we're talking about Wade, the NBA's prodigal son who manages to have one of the best reputations despite all of his "dirty plays".
No one talks about the time KG "accidentally" tapped Frye on his way up for a jump shot back in the day.