Once I wrote something and it worked well in Chrome and Firefox, but Internet Explorer had some behavior that made it not work well, so I tweaked it, and add the comment there, saying it is done this way or else it won't work well in IE.
So my coworker saw the code, and out right removed every single word of the comment.
If I ask her why she removed it, she'd answer something like, "it is no use". And if I say, "it needs to say why we do it this way but not the more obvious way." And she'd say something like "we write code, not comment". Together, she would throw in some tone, some attitude, and some temper.
I really don't understand why useful comments would be removed. So another programmer can see my code, spend 20 minutes refactoring my code, and then commit it, and now it is 20 minutes wasted, to introduce a bug back into IE.