Lots. Meh. Most of it is just bigoted opinions and them scoffing at things that aren't any of their business usually. Shit that can be ignored usually.
Had them constantly try to convert me after i repeatedly tell them no, and that their opinion on my theistic or athiestic beliefs is not warranted. Then they get all high and mighty and preachy and tell me i'm going to hell.They were just as pushy as jehovahs, but not as nice as the mormons who shoveled my driveway after telling them i wasn't interested (i did let them in to have hot chocolate and sandwiches as it was -20 on their mission).
In grade school i was attacked by one for not believing in his god and telling him dinosaurs are real. I made that fucker eat sand for a week. I don't attack you because you don't call him Yeshua...ffs
Had a few of my family members molested by catholic priests. (if you want to count catholicism/protestant etc as christian denominations).
Seen legitimate gay bashing in front of my face, it turned out horribly for them when they realized the gay kid could scrap. Had other friends kicked out of their homes because they either didn't believe in god, their parents god, were gay, had sex or drank a few times.
Too many are preachy at my university about abortions (let's not drag this out in this thread).