Surely you can come up with a better strawman arguement than that, Destro.
Benedict Arnorld, Timothy McVeigh, Eddie Slovik and William Calley were all veterans.
By your strawman criteria, a criticism of Calley's war crimes, a criticism of Slovik's cowardice and a criticism of Arnold's treason would all qualify as "spitting on a veteran".
Have you ever considered that every individual's military record is unique and that the mere fact that one is a veteran does not automatically confer sainthood upon the individual nor immunity from an objective analysis of his military record?
Why don't you try to at least attempt to make your points by arguing the facts instead of confining your debate to throwing out silly strawmen?