European Job ads - "Must have a EU-27 citizenship" - denied?

[mos]

UK should do the same in reverse MUST have UK citizenship as surely if EU can openly do this it cannot be illegal to discriminate in the UK can it!

Sooner must have a Commonwealth country citizenship. And as E8 citizen I can testify that its effectively happening since at least 2016, when my career went down the drain.
I also observed that the biggest racist bullies I ever came across working in UK are now contracting in Netherlands and Belgium, while I am being turned down even for jobs in my own country.