On Monday evenings, I play casual indoor football with a group of people that work on the same technology site as me. My boss and I have been going since before I started working for him and everyone generally gets on very well.

I have a tendency to get frustrated at football as sometimes I don't play as well as I would like, nothing drastic, I might punch my leg or curse but nothing loud or at anyone.

Today I was having a poor day and while I wasn't playing great I was trying my best, but I had missed a couple of shots and was obviously a tad annoyed.

While I was other players had the ball my boss came up behind me and said 'come on!', in what I deemed to be an unnecessary comment. Looking back it was not a provocative tone, but not kind either.

Either way, I let out a 'fuck off' under my breath at him. Loud enough that he could hear it, but not loud enough for anyone else to hear.

He naturally did not take it great and returned the favour, replying 'no you fuck off', and at the end of the game he expressed that he did not appreciate me telling him to fuck off when he was 'just trying to help'.

So guys, AITA?