I work in an IT department with two others. My other colleague is a very confident type but not very knowledgable. He sometimes messes things up for others and people don't like him very much. Sometimes, he gets upset when others ask him for help. There are not very good references for him throughout the office. I consider myself to be a bit more senior than him and I usually help people and sometimes, they praise me. We both work in the same office.
Recently, he was supposed to make a migration of our servers and informed all the department managers of the downtime. I sent him an e-mail to first confirm with us the steps he will be taking, as we don't want him to repeat an unpleasant situation (he upgraded a account management system to a latest version that annoyed and confused a lot of people without telling them first etc.)
He had replied only „Yeah, I wouldn't have figured that out if you hadn't told me" out of the blue.
I have no idea why did he act this way. I seriously hope he does not see me as a rival due to our reputations. I simply wanted to confirm the changes. Not sure how should I work with this, as I am not an official „Team lead". His behavior troubles me, though.
How should I defuse this situation with him? Should I tell the higher management, HR...?