[randallsquared]

Some people can talk their way out of almost anything. I've personally had my mind changed about something that was totally obvious; it's a pretty bizarre experience, looking back. Sometimes it takes hours or days for the reality distortion field to wear off.

[atrk]

I've had at least one coworker like this at previous jobs. They've tended to fool me repeatedly until I notice the pattern and revise my opinion of them. The confidence they display makes me think they're smarter / more informed / more thoughtful than I am, until enough evidence causes me to stop all positive weighting of their opinions. It's worse when you have imposter syndrome for the first several months of any new situation.