I only met this uncle once in my life and he doesn't live in the same country as me. 

My dad has told me lots of weird things about my uncle, like how he married a girl he met whilst she was under age and 30 years younger than him. He lies a lot and pretends to get married to different women and divorced again, all without the rest of the family ever seeing these people. 

My dad is communicating with my uncle again but my dad complains that my uncle is asking him for money, for favours etc. 

I feel no connection to this uncle and I saw on Facebook he posts ignorant thing about 'muslims taking away our pork'...Which is ridiculous. Loud, outspoken but ignorant people really annoy me and I don't really want a relationship with my uncle. He posts angry rants on Facebook and it makes me uncomfortable so I 'unfollowed' him. 

But AITA for not replying to his message to me which just asks how I've been etc? I'm 24 years old and we haven't seen each other since I was 4 and I don't plan on seeing him either. Does being family mean I should reply to him? To be honest I don't really like messaging anyone on Facebook and prefer talking face to face. I don't want to get into a back and fourth conversation with him. 