Re: So this is punishment for supporting Brexit
Brexit took place on June 23 2016 and GDPR became legally enforceable May 25 2018.
Nope. The decision to start Brexit happened then, Brexit itself won't happen until March 29th 2019. Anyway, since UK consumer and data protection law has always been consistently more strict than EU requirements, and the UK co-operates closely with Canada on this, it seems unlikely that Brexit will change this case.
Besides anyone who thinks their personal data is private on facebook is deluding themselves.
That's certainly true, but doesn't exempt Facebook from havig to follow the laws of the countries it operates in (and EULAs that say otherwise are invalid).