Insult the credibility and bravery of the person and mock their injury.
And your ducking the point. Is that how you aquired your 30% disability? Your pretty free with your "coward/traitor" mud slinging, but when it comes down to it, you aren't exactly a profile in courage, are you. Why not regale us with how you earned your 30%. Was it charging  a machine gun nest single-handedly, or something similar? Do tell.