Don't get me wrong I love lesbians. But, almost all the chicks that claim they are BI, by making out in public w/their friend are not. They are just doing it for attention or to get back at daddy.
The best move is to simply walk by the 2 chicks making out. Nothing pisses them off more. The last time I snubbed 2 chicks making out. They were so pissed. They said I must be gay. I told them "I was banging real lesbians when you were still on the teetertoters." (They later admited they did it to have chumps by them drinks.)