How do I deal with homophobic parents?

My mum doesn't believe I'm gay, apparently it is a phase. Despite me coming out to her 2-3 years ago.

My dad just knows, I've never said "I'm gay" but I've told him I've gone on dates with guys and things to which he says he's disappointed. He calls me things like poofter etc. He regularly says things about gays in the news like "disgusting ******s" "don't bend over around men like that" "willy woofter" even though I've told him to stop saying things like that. My mum doesn't support me.

I try and normalise being gay to my mum by speaking about my boyfriend of a year and half who makes me very happy and is a good match. She NEVER asks anything. She tried to avoid the topic completely. She acts as if he doesn't exist. I forced her into meeting him once and it was almost comical how she literally said Hi and left and was extremely awkward.

It really hurts me when I see my brothers girlfriend be accepted etc.

She's happy enough to say she's proud of me for going to Cambridge but just ignores what I suppose is a pretty big part of my life.

During vac, home just feels like a massively depressing and suffocating place to be.