lol. Vietnam was not lost at home. That's one sad case of revisionism.
Hell, as history, this argument didn't even show up until the early 80s. Sure, you have policy wanks bitching about hippies and the anti-war movement during the war, but blame was never cast in force long after the fact--it's merely to assuage the guilt of failed military and social strategy.
There's also not a single documented case of an actual hippie spitting on a returned soldier. Like the supposed bra-burnings of the feminist movement, these events are nothing more than urban myth (truth--not a single bra was ever burned for feminism; no soldier was ever documented as being spat upon), created years after the actual movement by those expressing anger over their own failed policy, or attempts to counter the movements that brought them some manner of supposed grief.
seriously, hearing this from a Col and veteran of the Vietnam war the other day, the first "documented" suggestion of a Vet being spat on by a US citizen was actually in the film, "First Blood," during John Rambo's tirade about being treated like shit when he returned. This guy recently published a book about the Vietnam home front, and he never found a single documented case of the type of soldier abuse that we now tend to believe was quite common during that time. Personally, he didn't remember such things, so the current cultural mythology about those years was always at odds. :\