I did the BOS quests, and they like me now, but my only option when speaking with Yes Man is that I'm familiar with them and they should be ignored. Why don't I have the option to tell Yes Man that I want relations with the BOS?
Rob
I don't think it's an option, Yes Man isn't a fan (as you'll see by his dialog choices).
You can completely ignore all of them and quickly finish the Side Bets quest. If you do maintain relationships with a couple factions, they'll fight with you at the Hoover Dam battle. Otherwise... it's just all you (and the NCR if you haven't angered them too, otherwise... good luck on that).