Anglos pretty much always hated things that threaten them and other players that could beat them in domination over Europe.
They hated Germans because Germans were better than them, let alone ww2-era Soviet-Era united Slavs their other threat… now when they completely lost control over Europe and English imperial days are over, and their naval fleet is of no use anymore as it was during colonial days, they have become just an average European nation while Germany has become economic force and center for central and northern Europe, while Russia economic and influence center for Eastern and Souther-Eastern Europeans so English have lost their role in Europe and naturally they hate us all now.

Why do you think English want to leave EU? it's just because they're not number one and leader of it, but they are Germany's bitch so to speak, so they feel insulted by such position and they want to leave and make their bonds with colonial anglo countries.