i don't know how since i've never come out to him, but every time i pick up from him it's always "hey dude! alright man!", just very over the top masculine stuff.

maybe my brother told him, i dunno, but i felt emboldened enough to come out as bi too (i live in deep chud country) and he told me a fun anecdote about his buddies beating a homophobe trying to start shit with one of his gay friends. ended with telling me he wishes he was bi too. he deserves more respect than our troops