Someone I met today was rude.

I don't particularly want to spend more time on this topic, but etiquette when asking for help are as follows:

Don't tell the person helping you that they're wrong. Remember, you're the one asking questions because you don't know the answer.
Females do not know less than males. Insisting on talking to a man does not change the fact that you still don't know the answer.
Don't walk away because you think everyone is stupid. You're the one who doesn't know how to google your own problem.
Say Thank You. Even if you begrudgingly mean it, at least pretend to not be an ass.

Those are some of the basic rules of engagement. I may add to it in the future, but right now, this will do.