If you ever want to suddenly hear a lot of racism, ask any European about the Romani. I've literally heard many people, after stridently arguing against racism and discrimination, say "oh well gypsies are different, they actually are that bad".

Some European countries are behind the states on accepting that racism exists there, yes. E.g. in Germany there's still a very common attitude of, "well, we're not racist here" even as anyone with a non-German name and especially anyone not white struggles to rent an apartment. At this point in the US, acting like racism isn't a big deal or isn't common at all has become somewhat of a far-right position.

Now, in some ways the impact of racism is lesser in Europe, because there's less police violence generally and typically a much stronger social safety net.

Yes, many Europeans think that because they don’t talk about it and refuse to collect statistics to show it that racism doesn’t exist within their borders. Europe is just as, if not more, racist than the US. Just ask them what they think of the Roma people.

People probably don't mix up BLM (which was a movement protesting police brutality against black Americans) with some vague claims for racism ("Europe is much more racist than America").

This is only true if you have an extremely narrow definition of "white".