The thing is, I don't look down on somebody who avoided the draft. You don't want to go to war? Understandable. Dick Cheney avoided service too. So did famed Trump supporter and connoisseur of underage girls Ted Nugent.
The problem I have with it is if you avoided enlisting or being drafted, but trying to act like a tough guy like you obviously aren't, is you had your chance to prove yourself. You don't deserve to be able to act that way, claim you're a war hero, disparage actual veterans, or anything else. If Biden, Clinton or Obama had said even 1/10th of the verbal diarrhea Trump spews, you'd be howling for them to resign.