I have a few younger readers, so I think--if I don't sound too obnoxiously avuncular here--it's worth pointing out that there's a much more general lesson here. There's a little technique we fusty types call PAYING ATTENTION TO SIGNALS, and people who don't know how to do it end up getting themselves into all kinds of trouble, whether they're trying to make friends, establish business contacts, or realize whatever other designs they may have on people.
If your approach is failing, you need to change it. The number of people who don't get this is truly startling, and you can tell they don't get it because they keep repeating the same unsuccessful tactic, only more loudly/emphatically/insistently. Not everyone likes to give his phone number out to someone he's just met, or have rousing political discussions with strangers at dinner parties, or participate in impromptu sing-alongs. People who don't are unlikely to warm to you if you try to force such things on them, but they may be perfectly willing to get to know you if you settle for an e-mail address or talk about non-controversial interests the first few times you meet them. (I can't think of a good substitute for the sing-along except getting the hell out of there.)
Along with that, you have to make sure your opening gambit allows you to retreat gracefully if it doesn't succeed. If you launch into a political tirade under the assumption that your partner in conversation's views coincide with yours, you'll have a terrible time trying to backpedal into giving him a respectful hearing if they do not. Or (this example may drive the point home more memorably--thanks, Michael's neighbor!) if you show up on someone's doorstep drunk, naked, and tumescent, you'll find it difficult to save face with the pretense that you were just seeking a nice chat and some warm evening air.
