Shrek, I didn't attack him, I suggested a course of training which would be best for his health and long-term physical development.
He gave me a reply straight out of bodybuilding.com Teen Misc subforum.
Camopay, if you miss out on training a body part, you get all sorts of muscle imbalances which later on lead to discomfort and pain. For example, I know a guy who only does bench, bicep curl, tricep pushdown - and he can't put his hands behind his head, and has a lot of shoulder pain. If you miss out training legs, you end up with a back in pain. That's because even if we treat our body as a bunch of parts in the gym, actually it's a whole. It works together, if one part is much weaker than another, we get discomfort and pain.
So even if you don't care how your legs look, presumably you don't want discomfort and pain years from now.
You came here asking for advice, you got it - whether you like it or not.