I also disliked Jenn the first time I watched her. (This would have been around 2012 or 2013.)
She acted drunk, played stupid for no reason, and just came across like a loudmouth b*tch who would start a fight with you for no reason. (any woman who has gone out to bars, clubs, etc. in college or as an adult generally know that kind of gal well).
To the contrary, Tim seemed normal, down-to-earth, and fun to me.
Obviously, over time, my impression of Tim has changed. However, my initial impression and current opinion of Jenn never has.