When creepy people talk to you at the gym...

You're in the middle of your shoulder press when some middle aged man comes up to you and asks about your shoes.  what has this world come too?  People need to understand if someone is listening to his or her ipod, he wants to be left alone when working out.  I love watching people, and I often notice pretty women at the gym get freaked out when men twice their age try to pick them up.  Sure, I'm all for conversation, but wait to ask me a question once I'm done with my set.  It's just disrespectful.  Another thing that tends to bother me is when you see people staring at you while you're making weird faces because you're trying to lift weights.  Enough is enough.