Up For Grabs, Is This Tropable, Needs A Better Description, Needs More Examples
Usually shows up in extreme instances of You Go Girl(to see what I'm talking about see You Go Girl under Live Action TV), Though it might exist other places as well. It seems like the Established male characters will suddenly become Male Chauvenist even though this didn't seem to previously be part of their character. This sudden change in character (Could probably be considered a form of Character Derailment)seems like it is used mostly to advance the plot the show or movie it occurs in.
Live Action TV
Small Wonder: Ted, Jamie and Reggie in the camping episode.
Two of a Kind: Kevin and especially Paul in the episode Ashley tries to date the boy who is obsessed with sports.