Elaborate. What is it that you say that is perceived as rude?

i was walking on the street and there were 2 girls walking ahead of me. a guy was walking in the opposite direction and when they got close he told her "hey, happy birthday" a few seconds later i caught up with them and told her "hi, happy birthday"
the friend asked her "do you know him?"
the girl said "no"
I said "what? you dont know me?"
she said "no"
I said "maybe you should get your memory checked"
the friend said "that's rude"

what I'm very interested by the idea women have of guys being "rude", given that women have no problem admitting they like bad boys and guys that don't conform. In this instance, perhaps the concern was that you were invading their space, verbally. "Rude" was her socially mandated way of describing this. But really the word means nothing. What she's saying is "dude, we're not sure where you're coming from and you're creeping us out a bit".

I'm guessing it was when he suggested that she get her memory checked. The problem here is the whole "neg" mentality. It basically went from Approach->Neg. There was nothing that she said or done to deserve that, so it could be interpreted as rude. If he would have answered with, "I just heard that other guy wish you a happy birthday...", his chances would have been a lot better.

Street approaching is the last thing you should be doing, Bart. It is literally the most difficult way to approach women. Even very good looking, smooth guys are going to have huge rejection rates.

A much better way to approach is like so. As you can see, you're going to have a heck of a time getting good signals in the street. Go for semi-stationary girls.

Though that guide doesn't mention it, if you're doing daygame, go to the touristy areas where you live. You'll have much more success with tourists. Especially foreign ones.