Right, let me start by saying, I am a Steward. I don't work in the North Stand, so I an unable to comment on last nights event's and it wouldn't be fair to comment on what might/ might not of happened. However based on my own experience, a fan would not of been removed for the pure fact that he was "singing a song", there would of been several other factors involved in his removal, however like I said before I couldn't possibly comment.
You just did.... while dismissing lots of peoples claims to the contrary at the same time...its precisely this "he must have been up to something" attitude that is letting this stewarding problem escalate.