My ex-manager was the reason I left. He was.... odd.

You could warn him in advance about an impending negative issue. You could use lights, fireworks and even shout in his ears, but he would ignore you.

The the issue would occur and cause problems, big problems.

He would then ask "Why didn't you warn me?"

I would pull out my paper trail of emails, meeting notes etc.

To which he would reply "You didn't try hard enough to get my attention."

And that is why you don't put a career salesman in charge of your IT department.