According to Section IX of Ukraine’s 1990 Declaration of State Sovereignty:
The Ukrainian SSR solemnly declares its intention of becoming a permanently neutral state that does not participate in military blocs and adheres to three nuclear free principles: to accept, to produce and to purchase no nuclear weapons.
Yeah, I think it is just impulsive. They don't seem to be trying to save face or reframe their argument, I've seen no moving of the goalposts with this one, literally just saying that they are better than the evil tankies for refusing to read anything they say.
They either have 0 self-awareness and honestly think it's a slam-dunk argument to both call people an echo-chamber and refuse to read anything that contradicts their own viewpoint, or maybe,
They might be doing this on purpose. I think they're fishing for a ban, that's why they're especially obnoxious, they're trying to get a ban so they can go back to lemmy.me or whatever and talk about how the evil tankies banned them for "disagreeing with them." I'm guessing they want to be congratulated by like minded bootlickers for their matyrdom.
That could very well be the case. Regardless, like comrade Catradora said, they just need to climb down from the cross. It's clearly not working if that's what they're after.