I don't think it's attire, I think it's the use of blackface.
or in laughing off those offended.
It's a bit sad that you think people deserve to be laughed at just because you don't care but I guess that "everyone just wants to be offended" schtick is still thriving on here. There's a historical and social context as to why many would find this offensive and that's been around for a long time, so it's not really accurate to suggest any objections are entirely a modern thing.
That's not even the point, the point is that he knew what he was doing had pissed people off, laughed at them and then pretended he had no idea it was offensive at all and that he was deeply sorry for those he upset.
That's a pretty weak move and I think I'd have more respect for him if he stuck with his convictions rather than pretending to act innocent. It just reminds me David Beckham's manufactured image (Griezmann's idol btw) and I don't think I could ever really appreciate someone that puerile and vacuous at my club.