dont wanna add some bum to my coop, how I make it not let me?

[Speedy1149]

ok so bassicaly theres this bum named sonny and ion wanna add him to my coop, how do I make it so when I got /coop add (his username) it says something instead of actually adding him so it doesent look like I am able to add him cause just now I did his username with a 5 instead of an S and he didnt rly believe that so I said my dog was dying and dipped, how I make it look like I cant add him, or just any alternative to not have to add him, its me and my friend in a coop that dont wanna add...

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