Is there anything wrong with discrimination against tall people? It has nothing to do with their age, race, gender or sexual preference, so I think height and weight may actually be fair game.
Car insurers charge young people more money, despite their youth being outside of their control.
It's dangerously close to an argument such as "People of color have to pay more or can't use this service at all" or "Blonde hair blue eyes" you know?
I don't know how you confused discrimination with murder, but you should probably double check a dictionary.