Read on Twitter
"all men are trash" isn't a personal attack directly against each and every man, it's a distilled expression of an observed/experienced tendency of patriarchal violence (and even if it was a personal attack, it has not systemic power behind it) https://twitter.com/shaun_vids/status/1329543301381431298
sure, I might feel sad for half a second if some woman crosses the street to avoid me but is it reasonable to expect that person to choke down the terror and/or trauma that she has likely experienced just so I can have half a second less of transient sadness?
not really.
not really.
as a distilled expression of an experienced tendency within patriarchy, it obviously isn't meant to be an expansive, philosophically-robust theory, people like Shakur or Butler spend books and books fleshing this stuff out, if it could be sorted by one sentence, it would be.
instead, I believe, the point is more of a psychological self-affirmation against patriarchal domination (much like how Fanon describes the role of revolutionary violence in decolonisation). it reminds the victim that they are not to blame for the violence they have endured.
Shaun talks about how it's weird men sometimes say this and he forgets his earlier disclaimer: no (cishet) man can say "all men are trash" in full seriousness, human psychology, naturally, has powerful mental barriers and diversions to prevent true self-hatred.
I don't think it's controversial to say that of you're a man and saying "all men are trash", you are *sigh* signalling of your virtue. to truly follow through on your self-professed belief, you would have to acknowledge your saying of the phrase changes nothing (which is true).
like, ML twitter has just gotten it's own very recent taste of this *sigh* virtue signalling with the recent 
(mango emoji) ""movement"" (I use that term very loosely), which had as a prominent member, a guy asking minors for pictures of their thighs to rank in a contest.
(mango emoji) ""movement"" (I use that term very loosely), which had as a prominent member, a guy asking minors for pictures of their thighs to rank in a contest.
turns out saying your anti-sexpest and putting an emoji in your BirdApp™ handle doesn't stop you being a sexpest. saying "all men are trash" as a man doesn't mean you deserve to be treated any differently, by the statement's own logic (which once again, is completely true).
going back to my earlier point, saying a sentence on twitter is not going give you a comprehensive understanding of patriarchy as a man (assuming that it's even possible to transmit that level of understanding via language in the first place). read feminist scholarship.
it's not so weird that men do this after all: either these men are virtue signalling because they think this makes them different (or maybe even because they feel guilty and desperately need to perform misandry for external validation/absolution: the less charitable version).
finally, his point on the essentialism doing collateral damage to other oppressed groups: that's not wrong (all statements oversimplify by necessity to varying degrees) but it lacks nuance. essentialism is extremely well tolerated in almost every other situation, why focus here?
I think essentialism doesn't do a great job at understanding the universe's inherent complexity and this happens in the vast majority of typical discourse around anything: random people on twitter only bringing this up when it's "all men are trash" is inconsistent/dishonest.
absolutely, it feels unfair that as a man, this category equally includes me, serial killers, peasants tilling the fields, imperialism veterans, abolitionists, etc. yet, due to its systemic nature, any of us could (un/)wittingly work with patriarchy against collective liberation.
that statistical trend that always remains true no matter which individual in particular is being discussed? that's what "all men are trash" is striking at. stop complaining about your sadness and start being willing to listen and learn.
this, finally, relates back to individualism and its form under patriarchy. men need to start acknowledging that there are much bigger forces at play in this world than your feelings being hurt by expression of male statistical trends. if it bothers you, try to change it. or stfu
