Re: How to deal with cockblockers or dudes approaching your girl?
Suave Kino is right. If you have yourself a good woman and she sees you as a good man she will not disrespect you by positively responding to another man's advances. Even if she is the conservative type, she will politely deny him. If he does become arrogant about it THEN it is your job, as her man, to let him know that she is with you and that it's time to go. But this is a situation that RARELY happens. At least to me.
If she is a brand new 'chick' and there is no real investment on either part, then you should befriend him, but also talk a little down to him. Not in a jerk way. No reason to get into an argument over a woman you haven't even kissed yet. Just treat him like your little brother that doesn't know any better. You want him to look up to you so he knows not to step on the alphas toes.
"All things are subject to interpretation. Whichever interpretation prevails at a given time is a function of power and not truth."