Whoa, to tell your current manager you were looking around? This is a good example of pushing on one part of bad culture and finding a bunch of others but wow, not cool.
In this case the hiring manager called my then current manager to ask what was going on, why I declined (even after I already told him), and basically trying to make me look like I was wasting company time or being rude.
Luckily I got another call later that day offering me a position with a different team, so i didn't have to deal with either of these managers again. Although we are a pay for performance shop, and I feel like the old manager screwed me on my year-end bonus (target is about $7k and I got $1k) and this probably played into that.