Most Helpful Guy
Wel, this is the world we live in, some people will just see themselves as deserving all the goods for them and fuck the rest, these kind of people would be the most prone to have high standards despite sometimes as you just mentioned, they themselves aren´t even up to the level of the things they expect to get, these people have a very huge ego and superiority complex, even when they won´t recognize this fact, and for them anything less than very good is bad, some would cope with it for a time, but when the chance arrive they will just turn on the fuck everything button to get what they think they deserve.
Most Helpful Girl
Yes. I have seen a 5'4 dude here calling almost every girl unattractive. I'm not saying he's ugly but according to the society standard, he is definitely unattractive because of his height. People can make blanket statements but I'm sure no girls find short guys attractive.
The reason is because they are aware of their physical flaw and hate the fact that people pass judgment just because of something beyond their control. By calling other people unattractive or putting a higher standard to the opposite gender somehow makes them feel better or attractive.