“Cuckservative” and “teabagger” are examples of the left compulsively sexually harassing members of the right.
Teabagger, as a term, describes an obscene act and is a pure slur, it has nothing to do with what the Tea Party is all about. It's a crude epithet. It's not much different than calling democrats "A**H***S" compulsively.
Where as being "cuckolded" is really about lacking the self-respect to stand up for yourself and deal with intolerable forthrightly. That's a on target.
But I agree it is a sort of "sounds nasty" word. Someone above mentioned 'fracking'. Like that it has an appeal as vaguely transgressive without being actually a crude sexual profanity, as "teabagging" is.