Miguel signed up for match because he thought it might actually be a good way to meet a nice girl who shares his interests, but he assumes his roommate only signed up because he is shallow wants to look through all the pictures and profiles. This is an example of the:

This is an example of social hypocrisy.

Explanation:

This is something that a lot of people are wont to do but never actually find out they are doing it or see how they are doing it.

The person himself is not aware of their bias sometimes but they are judging others for doing essentially the same thing they are doing but only with a twist in the fact that they see their own motivations as better than the motivations of the others.

So while his own search seems justified to him, his friends looks like a shallow person.