Ever had someone say to you, Hey you look like____? Sure you have. We all have. Don't ever do this because almost always the person is offended. If they are not offended you have likely compared them to someone who is way better looking and your kissing ass so stop.
Over the years I have been compared to Jim Carrey in Dumb and Dumber, Greg Dobbs, and Joey Ryan (for the record Ryan was befuddled too) to name a few. So being compared to a retard, a pinch hitter, and a wrestler with a 70s pornstar gimmick doesn't really sing my praises. Surely you have been compared to random people in public or had people saw I thought you were someone else. Most people have high opinions of themselves because they think of the one time they attracted someone out of their league is their standard. However, if you going to compare to people its ok to do this behind their backs because its funnier this way and they wouldn't want to know anyways.
Being compared to another person that you regard as below you is the same feeling you have when you see who your ex is with. Your dating him? Really? He's better than me? So don't say you look like so and so unless you want to annoy someone.