I’m not active in much mainstream social media, but I’m not aware of many people who attack normal Russian citizens

You’ve never seen racism against Russians expressed online? People call Russians “orcs” all the time, and that’s only the most obvious example. Half of Americans seem to fully believe nefarious Russian plots decide their elections with absolutely zero actual evidence (edit: and Europeans are as bad or worse with the conspiracy theories). The comic is also talking about visa bans, which are a real-world consequence for all Russians and not just some social media thing.

especially when they’re complaining about their government?

This (I think) is just emphasis for the joke, but I assure you that I have seen this too. Also, as I said, the comic specifically refers to visa bans, which do actually affect Russians who oppose their government as well.

I’ve never been a fan of the whole «А у вас негров линчуют» rhetoric. Is it not possible to fuck America, fuck Russia, and fuck the so-called state of Israel?

That’s great, you can have that opinion. The comic is about how actual consequences exist for enemies of America but not for Americans. Also, at the time the USSR said that, it was, in fact, extremely true and a very apt way to point out the hypocrisy of the Americans presenting themselves as the champions of human rights - which is once again happening today.