He wussed out the only way he knew how: tried to call him on a procedural point, maybe in the hopes of getting his remark stricken from the record or something. Lefties can't hack it outside of a controlled environment.
Murtha would have said "Can I shake your hand?" and done so to applause and tears, and then gone on for five minutes about how we were the enemy and that crap.
I'm a son of a vet, though I haven't served myself, and such disrespect always burns me.