I got drunk and high, he said some bullshit about how only capitalisms could innovate something and I just went fucking off. He's good at verbally sparring and came back at me with some advanced* 
questions and I truly lost it. He's not a 1% but at least a 10% and I yelled at him for never producing anything and not understanding the real world. The pièce de résistance was telling him "you're a good guy and it sucks if you get run over in the revolution but it's worth it."
He really is a good dude and I'm currently living here for free! He even picks up my beer sometimes! He's really hurt and I feel bad.
*He has a good understanding of Nordic style socialism and very good knowledge of (the propaganda version) US history. So at least it wasn't babies first economics.
I keep my mouth shut about this stuff specifically because I don't like apologizing over things I believe.
Yeah, I didn't tell the whole story but it was warranted. I never apologized for believing what I do, I was just straight up wrong about my interpretation of theory and praxis, and when I realized that later it felt appropriate.
Other than that tho, man I just can't help myself. When people speak or act disdainfully towards classes they perceived as "below" them, I just get so fucking angry about it and can't let it go.