Why is there anti-union sentiment here?

[JVS]

Most of the opinions i've seen when the topic has been unions is positive, but there are recurring anti-union sentiments that I've been reading here lately. Stuff like "And his plan is market-based and costs 1/3 of Gephardt's plan (who is beholden to the unions)." Or "You let union member Bubba hear that, and he just might realize that he doesn't have to vote for Shrub again." Actually, the second comment is not so much anti-union as disrespectful and sterotypical of union members. Especially as it was about people in Southern states, which happen to be "right to work states" and a true wingnut would refuse to join the union and pay union dues, since he/she could reap the benefits of the union without contributing at all. Nevertheless, there seems to be an undercurrent on this board of dislike for unions. Why is this? Are some people getting mad because unions are not endorsing their favorite candidates? Are some of us opposed to unions politically or could it even be mere snobbery?

Edited: forgot to post as question.