How To Do It

It's actually quite easy once you have the console enabled and a particularly irritating player thinking they have you at their knees.1) Open the console.2) Type "status" (without the quotes, obviously) and hit Enter.A list of all players on the server should be given, but as this is Mann vs Machine, most of them should be robots.3) Find the Spectating player on the list provided in the console.4) To the left of their name is a numerical UserID. (NOT the SteamID!) Remember that number, or copy it.5) Now, the coup de grace. In console, type (without the quotation marks):"callvote kick #"with # being replaced with their numerical ID, and hit Enter.If a box appears asking you to vote to kick the player, you've done it! Congratulations!