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Similar situation on Saturday...guy chirping nothing abusive just constant drivel 92 minutes walks past me and goes..."get a red shirt on ref"....eh hello can I have a word please YC next comment like that and you will be shopping with the Mrs next weekend. I YC for dissent as it was an indirect or implied cheat call if he had of said it directly he was walking!
If you as referee have allowed or tolerated someone to chirp away at you for 92 mins then you are (imo) not managing the game correctly, granted you say its nothing abusive, but, liken it to, fouls committed which are nothing serious. Still fouls. Would you accept 92 mins of "little fouls" by a player?
To caution, (presumably for dissent or an accumulation of dissent) on 92 mins is (again imo) exceptionally weak and its a mere token gesture card, than a card being used for its real and proper meaning, a match control tool
I would also state (in my weekend league anyway) that a double yellow in a game does not lead to an automatic next game suspension so it would be incorrect for someone in the league I do to use the line that "you wont be playing next weekend"
Unless of course you mean if he repeats the same offence, you are going to give him a straight red card, which would be entirely bizaree given that you have just judged his same offence as a yellow.
Everyone has their own wee gripes when watching a game and one of mine is a referee removing a manager in say the 92nd minute because he has finally had enough of the misbehaviour. Nearly pointless, do it on the 60th minute and give yourself a more peaceful last 30 mins and show people you are in control, you are managing and you are aware of environ. To do it on 92 is , for me, a token get out.