Still part of the EU at the time, with many expecting Brexit to either fizzle out or take decades to complete what did you expect? Anti-French no or very little, I don't remember seeing any. German some because Brits think Germany runs the EU. During Brexit it was mostly anti-EU as a whole.

You should have picked Poland, Romania, or Albania. Those are countries that British racists don't like, less so Poland these days.

What did the UK puposely make worse for the EU exactly?

Either way being mad at the whole UK population just seems a little racist and, Brexit passed! Seems like you specifically should be happy about that.