I also have many friends like this and most new people I meet are the same way. It can be frustrating. In my experience it often comes down to semantics. If by "capitalism" they mean big corporations+the fiat money system+corporatism/”corruption" then yes, I agree with them. Fuck capitalism.

If by "capitalism" they genuinely mean free markets and private ownership of property, then no, obviodly I disagree vehemently.