When I mentioned to have social courtesy it was under the assumption that the dude would have social courtesy.
In the instance you brought up, just blow off the guy. Don't engage him with anything; just ignore. Remember; everything other than the woman you are pursuing is nothing but a fly. They mean NOTHING to you. Yes show respect if they do the same, but if they're yelling or whatever, your entire body language is to treat them like they are a bird squawking when you're in the park: it's "whatever." As though they aren't even there.
If they get in your face, again, don't grant them the courtesy of a direct reply. They are meaningless to you and your goals and are to be treated as such, in a non arrogant and non confrontational manner. If you feel a direct reply is warranted in the situation, just maintain a dominant friendly we're all friends all is cool frame. It rightly makes the guy feel like a tool for trying to stop a natural interaction. Think of it: The girl is available, she is wanting to meet a guy, he has no business trying to stop the interaction.
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Or do you tend to just make statements such as, "you look like you know how to paint." Lol
Your Lol implies that you realize these are garbage lines. Meld into the girl. She wants you, you want her. It's a man/woman dynamic. How can it fail. It's predetermined. That's the attitude to take. She wants it, you want it. It's up to you to not fuck up the interaction. The guy must lead. You do so by behaving as though it is all meant to be and as though she is already your g/f, in a socially calibrated manner.
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I usually just end up asking questions about them and their life and they get bored and run to the bathroom or something like that.
They want your fucking body. Desperately. Convince yourself of that. It may become a self fulfilling prophecy. They may become curious and start asking qusetions themselves.