Classic old MM says to bring girls for the guys before you hit on their girls. Or at least befriend them. In any case, the guys above are right. It's your job as the guy who approaches to make sure you have all angles covered. You can't blame the guy who reacts even if he acts childish/stupid/douche-y.
If it won't matter in 30 years, it doesn't matter now.
My thoughts and memoirs: yourfriendtrent.wordpress.com