"I appreciate you trying to help, but you have absolutely zero understanding of how bad things are. Be thankful you've lived such a sheltered life."
Being a little dramatic here. You're doing fine, but you feel different and isolated from your family. But things are really bad, huh?
Trust me, I've met bad. You don't know bad.
1) your situation is not that different from many others
2) you are probably not as different as you'd like to think.
You took a different path at some point. That path was good for you and it has changed your perception of life. You siblings took a different path. One that was not so good. They've reached different conclusions than you and now have different attitudes and outlooks.
If I had to guess, I'd say that you and your dad are much more alike than you know. He's checked out. Probably checked out a long time ago. Maybe he engages at work. Maybe he engages internally with Fox news or some other outside source, but he's checked out of the family.
You are planing on checking out of the family as well. That's something that a little similar.
You may have different views than your dad. You may think about life and the world differently. That does not mean you are not alike. Your life experiences are different, so you've reached different places, but the way you process things is probably pretty similar.
Look, it is what it is. You can't change them. You can either accept them and not let them bother you, or you can move on. You're brother curses and yells. So what. That's him. It bothers you? That's you. Learn to not let it bother you.
You are making it bad. Not them. You own your own reaction.
If you want to stay in the game, then I'd suggest two things: focus on finding a few areas of common ground (everyone one has some common ground - be it food, old TV shows, sports, shared past, or just having lived in the same house), and try to understand their point of view. Don't push your views. Instead, really, really try to understand theirs. Ask questions more. Talk about yourself less.