Option 3, as well.

Next time, if you get into that situation when you are invited to a party by a guy who then does not pay attention to you, DO NOT ACCUSE HIM of rudeness but just leave the party or find something (other than him) to occupy you while you are at the party.

His behavior is your data. To get untainted data, you should not interfere with how he goes about the evening on his own. It does not make any sense to relate to people who are, on their own, rude, but can get better with pointers coming from you. You do not need such people. You only need people who can manage being nice without your pointing them in the right direction. In other words, everything is a litmus test, and his behavior at the party was a litmus test. To administer a litmus test properly, you just mix the ingredients and stay back - you do not try to interfere.