What do you want to do?
Also, should you let your aunts keep you away from your father's funeral, if their presence is the major issue?
If your father has been good to you, and you can be there, maybe you can fulfil a request of his?
But it feels worse to pretend I respect those lying assholes or to listen to their boring life I don’t care about.
Do you have to? You could ask that you be excused from such convos and avoid them, right?
Not sure if you have some specific issues with your aunts tho, so do ignore this if there is some significant thing that is not considered

What do you mean by totalitarianism? Things like pro-USAmerican style ICE, DOGE etc? I think they are against that.
To be direct, I think they do see the USSR as a socialist experiment that did more good than bad and does pushback against the USAmerican govt propaganda that tries to portray it as some great evil.