Well, I know this is going down the political rabbit hole, but look at the outcome of the 2020 presidential election in the US. The evidence that Biden won and Trump lost is undeniable, at least if you use the definition of "the outcome is undeniable considering the standards of any previous presidential election in the US".

But still you have large swaths of the American populace (including, notably, the president elect) saying that no, Trump won the 2020 election. At this point, though, I don't even really see them putting forth any argument based on actual evidence that Trump won in 2020. It's just repeating the same platitudes of "it was stolen, the politicians are corrupt, ..." etc. etc. But it's like many people just accept now that this is an acceptable way to argue things, "if you repeat it enough, you get to have your 'alternative' facts" - like, they don't even really care that much that they don't have actual evidence to back up their position. That is the part that feels relatively new to me.

Yes: people consistently repeat that inmigrants are (criminals ((almost) exclusively)) despite never showing any statistics. I have seen people keep a printed list of inmigrant crimes (one of them, an Uber driver).

This happens in two countries, that I know. One of them is the US, the other is Costa Rica. I expect it to happen in all countries with important xenophobic populations.