I was watching the last season of Parks and Rec and in one episode a group of mensrights activists were portrayed as sniveling, whining, losers and were scoffed at by the protagonist.

I don't think the offhanded and cavalier way that the media treat men's rights issues is very concerning. I've seen other men do this as well including someone I admire, Jon Stewart.
I'm a progressive, but as a man recognize that there are legitimate concerns in this movement such as issues arising from divorce such as custody and alimony.
I loved Parks and Rec and had no problem with the girl power message, heck I even watch supergirl, so I have no problem with that type of messaging. I truly liked Leslie Knopes character until that episode, but frankly can't bring myself to finish the season. It was a mockery and charicature.
This movement had it's weirdos and fringe groups like any movement, but if we characterize a movement by it's fringe elements then aren't we as guilty as those who we claim are repressing us?
I don't know, it just bothers me that a group of people with legitimate grievances are laughed at and ridiculed.