Its a common feeling, at least among the idiots of the internet. Many people involved the DailyKos walkout also said if Obama won they would not vote in the election for him, because of his supporters.
And naturally, the McCain supporters are loving this, and have been make subtle statements to the Clinton crowd, implying that they went through the same thing with Ron Paul, and playing it sympathetic. Obvious ploy is obvious, but the sentiments seem to be spreading.