Mostly because you have a few people who go further than saying that the ref shouldn't have identified someone based on their skin colour. I think that is a reasonable opinion: it's best to avoid doing what he did. He should apologise, maybe go through a couple of hours of sensitivity training or something.
However, there are people like
@calodo2003 who advocate for draconian punishments - he seriously suggested a lifetime ban! That is disproportionate and completely unreasonable. Life in prison for driving over the speed limit. This has nothing to do with the whole anglosphere thing, it just annoyed me.
And then there are people who say he should have been mindful how "negru" sounds and that he should avoid using the word at all because it might cause offence. The same thing was brought up in the Cavani thread. And to that I say feck THAT. That is completely and utterly unreasonable.
If he wants to say black shirt (I know he didn't this time, of course), he should be allowed to do so in his own native language. And that's where the anglosphere thing comes from: RedCafe is, obviously, dominated by English speakers and there's a tendency to view everything through the lens of that particular language. Understandable but still wrong. As an example: the word "busy" sounds (and looks) very close to a derogatory term for gay people in Hungarian. It would be completely unreasonable if any Hungarian got offended by an English person using that word, just because it "sounds bad".