You may be confusing bros with jocks. SBF was the quintessential cryto bro, checking all the boxes of the startup / tech bro stereotype: young white man with a elite education, or a dropout of such, liberal values wants to change the world, quirky but a genius, filthy rich as a result of his own, totally self made business.
Well, that's the whole meta-joke, that he wasn't a nerd (what he was trying to project to fit in the startup/venture culture), he was in fact a bro with bellow average intelligence.
When people talk about crypto bros and tech bros that's the whole shtick, they are saying their targets are not defined by technical ability (which is stereotypically attributable to geeks). So pointing out he wasn't really masculine is failing to see the metaphor behind "crypto bro" used as an insult.
Part of the SBF schtick was the "anti-bro" vibes. The intentionally awkward, low social skills presentation is used by some major altcoin promoters too-- but I don't think many people would identify it as "crypto bro" and that's a big part of why its effective.
He wasn’t. He knew what people like you perceived a crypto bro to be and filled it while simultaneously filling the Wall Street trader wunderkind like Christian Bale played in the Big Short. He’s as crypto bro as the “pimple faced white kid in his mothers basement” that people like you call all hackers.
Edit: upon reflection, maybe he is indeed a crypto bro - nothing in your definition is untrue. Using my analogy above, Crypto Bros are the Script Kiddies of crypto. Apologies.