The act of claiming that something which is impossible to achieve in the reality we actually live in is a moral imperative is equivalent to saying the phrase "colourless green ideas sleep furiously" -- a statement that is grammatically well-formed but actually meaningless. This is roughly what marxist mean when we call something "utopian" ("nice fanfic premise, shame there's no way to bring it into reality").
Of course, there's always more to someone than whatever meaningless pseudopolitical utopia they profess. Someone who believes that we just need more education in schools about the issues in order to prevent climate change (a utopian belief that ignores actually-existing power structures) but who is an effective organiser against a local fracking site is still someone worth working with and talking to, and is definitely worth more to you than some pseudonymous microblogger with 100% correct views. It's vital not to be some purist sectarian: you have to work with people who you disagree with (up to a point). But you also need to try to convince them, if you think they're wrong, otherwise there's no chance of greater political development.
Anyway, with that caveat out the way: a lot of the so-called political discourse that floats around online is meaningless. Sometimes it's worth teasing out what people are just failing to articulate properly, but often you just need to understand that people are just striking edgy poses or responding (like a dog) to tone rather than (lack of) content.