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I can't stand people like this. What I've done in the past that seems to work is isolation. When this guy shows up, and you're already having a conversation with the girl, put an end to his chin music before it even begins. Keep your body situated towards the girl, only swivel your head towards the clown's direction momentarily to give one-word answers and responses. Exchange glances with the girl, as if to say without words, "is this guy serious?" Chances are pretty good that, if she actually wants to talk to you, she'll follow your lead and begin transmitting to the blabbermouth the "don't talk to me vibe" as well. Once that happens, he's as good as gone.
I hope this helps.
Excellent advice!