Is my brother's behavior to me normal?

I am 22. My brother is 25.

My brother (and my parents too, actually) used to harass me like this: He'd come bother me, totally out of the blue, unsolicited, and ask some opinion question, like, "Who are you going to vote for in the Presidential election?" and no matter what I'd answer, he'd harass me, call me an idiot repeatedly, explain "why," talk over me, and just in general be nasty about it. My parents do the same thing, but their harassment is patronizing; they try to make it seem like they care for me and they're just steering me in the right direction. But I'm smart enough now to know that they're assholes looking for a reaction, looking for someone to dominate so they can feel better about themselves.

So my brother is now a US Marine officer, BUT HE STILL DOES THIS. This is the extent of our communications, he refuses to speak to me otherwise. I'm dead serious. He only speaks to me when he wants to harass me. Or when he wants something from me. And he demands things from me, he doesn't ask.

So my solution now is to ignore him. Not even look at him. And it usually works, after about a minute he gives up and walks away (same with my mom). When I do this to my dad, he gets pushy shovey grabbie. And of course, mom and dad idolize my Marine brother.

I know they only do this to me to get a reaction from me. I know they are bullies. But it doesn't feel right that I ignore them like that, they tell me I'm stupid and immature for behaving this way, and part of me thinks I can outsmart them better than that. What would you do?