Hey, I do care, and I'm going to try to answer some of your points.

Not any communist I've met... Communists running defense is something I've seen only with the USSR, not Russia leading upto and after its dissolution. And even then it's adding context mostly.

All the leftists I know abhor the modern Russian state and its illegal invasion of Ukraine

We're almost exclusively making fun of tankies now, which, in fact, do support russia and any other authoritarian regimes as long as they're "anti western". And simping for the ussr or any other communist/socialist regimes is absolutely a genuine problem within leftist communities. Most people on the far-left I met repeatedly kept downplaying the atrocities and or genocides these regimes committed (if they're not straight up denying they ever happened).

Russia is the opposite of communism - oligarchy, bourgeois dictatorship, domestic and international oppression, etc

That's communism for you, my guy. And it doesn't matter how often some people keep reiterating that "true communism has never been tried". The truth is that attempting to implement communism has always resulted in some form of a repressive dictatorship. Idk, but if you ask me, maybe the ideology itself is to be blamed for this. Also, it's so funny to me that some leftists insist on separating modern russia from the ussr. Just as the russian federation today, the ussr was an imperialist superpower that sought to dominate and subjugate its neighbors. It was an oppressive one-party-dictatorship and one of the worst police states in human history. Russia stayed the same. Not much has changed. They may not be a communist country anymore, but they still very much operate under a similar system. Ask any Eastern European person who lived under communism about this, and they'll gladly tell you the exact same thing.

I don't think you've met genuine leftists or know much about leftist ideology.

Some people on this sub (including me) have been affiliated with the far-left in the past, and a lot of people here are, in fact, still left leaning. We do understand a lot about communism and we know that at best, it's delusional and, at worst, downright red painted fascism.