My sister and her husband had a big fight. She just got divorced. Why is my sister and mother taking out their frustration on me?

[Anonymous]

Suddenly my sister and mom started hating all men and me. What did I do?

[Oigit]

Chances are they are angry about the divorce and started going down the I hate men rabbit hole and since you are a man, that means they have to hate you too.
That is why painting everyone with the same negative brush is never a good idea. Because you would be surprised how many times it can lead to in fighting. Even in a family.

In general I'd avoid them. Also if they ever try to make contact, you better demand an apology. They also need to be the ones to make contact. Because if you do chances are that you are going to catch even more flack. Because people can have this weird thing where they think that because a person is willing to engage with them after they treated them like trash, it's ok to continue to do so.