Most of those females are just guys pretending to be female, they try to see the straight guy nude on cam for their pleasure.
Just keep this in mind: if they don't want to show theirself on cam, ignore them. Or if they use the excuse that they can't cam because they don't have one, ignore them. There are women here, just not as many as men. And the fake women here aren't here to get more men on this site. It's still a site focused on penis... Men are still more interested in that than women.
I am a woman who is very selective about who views my cam. Now I only let friends view my cam, but I'll chat with anyone in the general forum. Even in the very beginning I was extremely selective about who I'd allow to view me. A lot of the other women in video chat are the same way, too.
I'd pay attention to whether a woman is a member of the Real Woman's Group, which usually appears on a member's profile page if that person hasn't chosen to hide her group memberships. You could also try asking another woman to verify if someone else is a real woman. I've had several men ask me if someone is real.
you chat with them once and that is it no more chat or connection and no proof of who they are and this is just from a general chat, nothing that would have offended them and caused them to ignore you.
Sometimes I'm so swamped with attention in video chat I can't keep up with everyone and it's difficult to carry on 12 conversations at once because I just can't type that fast. It angers me if someone I've only chatted with once gets mad, possessive, or demanding that I pay them attention every time I'm in the room because I've spoken with them once already. Just because I've conversed with you before doesn't mean that I owe you as much attention as you want whenever you want it. Sometimes I'm in the middle of a conversation with a friend about his mother's recent passing, or something else equally attention occupying and I don't appreciate the sense of entitlement from strangers that make him act demanding. That's how you'll end up on my ignore list.
Declaring, "But we chatted once before!" won't make me chat with you. That doesn't mean I have to chat with you again, or that the reason why I'm not chatting with you now has anything to do with you.