Guys, if a girl stood alone in a club, would you consider her fair game?

Would you approach her and think she is after , even if her body language tells you otherwise? If she is not that dressed up and not dressed like a tart? Say she is waiting for a friend to come back from the bathroom? I ask this because I did this and all the guys thought I was after it. One dragged me away from my friend and would not stop till I kissed him and gave him my number. He was very persistent.