On the contrary, in the UK (and Ireland) people are extremely racist towards both Travellers and Roma. They treat both races with equal contempt.

I'm not saying this to excuse the negative behavior of the Traveller or Roma communities which I've been on the receiving end of several times.

However, we need to look at this from both ends and accept that us (the ethnic majority) automatically treating members of a particular ethnic minority as scum doesn't help to change their behavior.

If a group has a tendency for bad behaviour should it be ignored because they are a minority? Why shouldn't the majority be allowed to call it out?

The racist part is generalizing the behaviour of some people to everyone of that ethnicity. I'm sure a few decades ago you'd easily find plenty of Europeans telling you they are not bothered by the Jews' ethnicity per-se but by their behaviour.

Godwins law.

It was the first comparison that came to mind. You can replace my example with comparison to generalizations against black people in the US if that doesn't break the Internet Law.

Godwin's Law isn't "if you mention Hitler you are wrong".