I hate when people passively question a factual statement youve just made without offering any sort of support for their challenge or showing any interest in getting to the bottom of it. There are a few phrases that in context embody this disgustingly rude response:

"Im not so sure about that"

"I dont know about that.."

"Im pretty sure thats not right"

"That doesnt sound right"

This chick Im friends with does it all the time and I fucking hate it, I feel like fucking chokin that bitch out everytime she does it. Its not that she is disagreeing with me, its that shes depriving me of knowledge she should be providing when disagreeing with me. Its an important way that people learn, through discussion. When you take that away from me I just think youre dumb and rude.