Never heard of anyone kneeling for Il canto degli italiani.
I don't think I have ever heard of it getting boo'ed for political reasons either at least recently. Certainly not for regionalist causes, since South Tyrolean separatism is quite dead now - and in any case South Tyrolean teams suck at football, and pretty much every team sport.
I know there was a time when the anthem was considered "right-wing" for some reason* but I think it was ignored more than it was boo'ed, and this changed around the time I was born. I should note that technically it has only become the official anthem by law in late 2017.
*which is absolutely ludicrous to anyone who knows something about Goffredo Mameli and his ideals
Didn't the leghisti use to whistle when it played? Back in the Bossi days I mean.
