Well, I fundamentally agree that it sucks to call all men scum or trash or whatever. Generalizing tends towards sucking as a whole, and as the target demographic being called scum it doesn’t feel great.
I just try to step back and understand the why. I genuinely do not think most people saying “all men are trash” actually believe that, but they’ve been radicalized by pretty understandable circumstances to feel the need to lash out. It really, really sucks that we have prime examples like the original twitter poster demonstrating exactly where that emotion comes from.
Do you try to understand “why” racists make racist comments? Do they get the same benefit of the doubt you give misandry?