Guys in a bra?

So at work we were talking about going out when it gets warm out without a bra. Jokingly we asked the one guy that was there in the break room what he thought. He replied with “ I’m not one of the pretty people but I have man boobs and probably should weare a bra. I’m not getting any younger and gravity isn’t helping.” The he just walked out. So would it be acceptable if this guy did weare a bra? He was not huge or gross. I would guess maybe a full A cup or barely a B cup if anything. I do t know how I feel about this????