HELP! Please give me signs that a gay/bi/queer guy is fuckboi

hey everyone. i'm super embarrassed to be asking this but can someone please give me some signs that a gay/bi/queer guy is a fuckboi? what are signs that i should be looking for/paying attention to know that a guy is not worth my time? google was no help because apparently fuckbois are only straight. i have very minor experience trying to date men and so far it has been horribly hilarious because i'm too nice. i'm 24 btw.i'm kind of sensitive guy who wears his heart on his sleeve so i don't really get the dating scene.thanks...