Does some sort of payment coincide with females doing sexually provocative displays?

Let me elaborate.

After we played a show (after the superbowl), I was feeling rather good about the show we did, so I decided to stay and have some fun. Well, later in the night I was hanging out with two very attractive women that were really friendly with each other. So, being the man I am, naturally I was befuddled and mesmerized.

A guy later sat down and said (to me), “Instead of standing there watching, how bout you give them something.” This was upsetting to me.

Is it normal to sort of egg on this behavior as to provide some sort of payment for the act? The girls were just having fun as was I. Was I wrong to just be enjoying myself or was this guy insinuating that I was obligated to pay for the fun?