Obviously intent comes into it, where wearing a reductive costume without any awareness (your Halloween costume example) is callous and ignorant of that person. I think some ignorance can be excused if this person couldn’t reasonably be expected to understand all the implications of a costume, even if it’s someone who should be expected to (thinking Trudeau Jr or Prince Harry when younger).

Regardless of the hypothesised (or real) impact to the community of someone wearing clothing arguably offensive to minorities with ancestry in the culture being mocked, those aspects aren’t what this cartoon is about. It’s about idiots who don’t understand nuance and repeat shit they see on social media unthinkingly until you get this absurd situation where someone wearing a hat and wearing it well is screamed at in public for no discernible reason.