Let's be clear, Barry Bluejeans isn't bi because he's in love with Lup. She's a woman, full stop, so normally I'd be fine with reading him as straight.
Barry is bi because his only reaction to waking up naked to two guys (and a walking talking mannequin) in his home was "WOW must've had a wild night lol better get dressed". No panicking over what this means for his sexuality, just calm acceptance and a request for the clothes Merle is holding.
Barry found it entirely possible he partied nude with some dudes, and you'll never convince me he wasn't wondering which of them, if not all of them, he fucked.













