Ok, so, first of all, people vote in China. Like, they do. They have elections there. If you're defining democracy as "a system in which people vote", then by that definition China is a democracy. (Full disclosure, I don't think that's a great definition and I don't think China is a "liberal democracy" like the US is, but at this point, we're getting hugely into the weeds of different political systems and I don't think now is exactly the time for that.)

Sure, the hexbear posts that make it to the top of the "all" feed aren't going to be the ones where we're talking theory, they're going to be the ones where we're dunking on people for shitty political opinions. Fair enough. That's true. It doesn't mean that theory posts don't exist, just that they aren't as contentious as dunking posts. That's an indictment of the internet and social media, not of hexbear specifically.

Hexbear does talk about liberals a lot, because they are the political group in power in the west. It's probably worth pointing out here that (american) republicans are, in fact, also liberals. So when we say "libs suck", we are also talking about the american republican party. Republicans are more open than the democrats about their genocidal tendencies, but fundamentally, republicans and democrats believe the same things and act in the same ways. They all think capitalism is cool and good, they just have slightly different feelings about which tactics to employ to keep capitalism as the dominant economic system. So it's not that we ignore republicans, it's just that it can sometimes look that way to people who think "liberal" means "democrat". It never has historically, but because political education in the US is so fucking garbage, a lot of people think "liberals" and "democrats" are synonyms.

And your last point is just wrong. We know that voting is never going to bring about real change, but that doesn't mean we only want to complain. The usual advice is to get organized. It's to find a local group that is on the ground helping people and get involved. Start working to build non-governmental power in your local area. Make connections, talk to people, help people, so that when world events are exploitable, we communists are ready to exploit them. It's fucking hard, especially in the US where our government has spent years and years trying (and mostly succeeding) to make "communism" a dirty word, but just because something is hard doesn't mean it's not worth doing. The idea that voting is something that will affect change is laughably incorrect. We could get into it, but let me just point out that the electoral college exists and that in my lifetime there have been not one, but two presidents who have been elected to office even though they lost the popular vote. Does that sound like a system in which the mass of voting people can bring about real change?