Guys have this automatic “checking out” reflex when a person enters. I even find myself doing it at the gym when someone walks in, and sometimes it’s even a guy I’ve just looked at. If it’s a girl I’ll automatically assess her body and what not. Doesn’t mean I find her attractive or my type. Just looking at her like “would I”?
As for the guys you spoke to, maybe you came on a bit too strong, gave them the impression that you would stick around even if they didn’t show too much effort.
I generally feel that women have terrible game. When I approach a woman as a guy, she’s expecting me to lead the interaction, that means I have to pace the conversation, introduce closeness at the right places and create space at the right times to cultivate that perfect level of interest and attraction. Maybe when you went up to these guys you kind of expected them to do that to you without realising you were doing that?
Is it possible that you didn’t realise it was now your responsibility as the approacher to manage all those things?
Finally, it maybe that they felt emasculated by you leading the attraction and lost interest. Some guys only feel secure if they’re in the masculine chasing position. I don’t know how you feel about that but I’d say you probably dodged two bullets