I have never had a problem with self-defense. My problem is how often some folks talk proactive violence against a fairly vague definition of “bourgeoisie”, or merely “the rich”. And (I’m sure you can understand why I’d have a problem) that some folks talk like I’m in the receiving-end category of proactive violence.
I know it’s not popular here, but I hold Communists to the ACAB-rule. For me to consider respecting a member of ANY group where a substantial percent is advocating for violence against myself or those I care about, or proactive violence at all, I need to know that person strongly and openly opposes that behavior and is part of trying to fix it. If you do that, I’ll happily have a beer with you.
I don’t think Communists and Tankies are the same thing, but a lot of Tankies are pulling “no true scotsman” even here about advocating for violence against (for example) liberals.