Lemme tell ya what a JERK Margaret's father is. An overprotective needy bully. And even worse, Mordecai insists (no-one told him) on kissing his ass*. Rigby is totally right: "you wanna date Margaret, not her dad".
Not a bad episode, mind you. I'm just appalled by their behaviors. Character development wise, Mordecai showed he's a doormat.
P. S. 1: no, no similar personal experience. XD
P. S. 2: I didn't mark as spoiler because I assume people only come to discuss an episode after watching it.
*This doesn't count as foul language, does it? I can always edit.