"A Matter of Honor"
The new crew members and a part of an exchange program, a Benzite, beam aboard.
Wesley: Mordock! You couldn't have graduated from the academy already!
Mendon: Mordock? I am Mendon.
Wesley: Oh, sorry, I though you were a friend of mine.
Mendon: We are from the same geostructure, naturally we all look alike.
Wesley: How do you tell each other apart?
Mendon: ... We just do.
Yes, Wesley, I'm sure all
Benzites look alike to you!
Well maybe they do, have you ever considered that? Since their aliens, its quite possible that they all look alike and Wesley Crusher isn't just saying that as a put down.