Etiquette question

[Bizarro George]

I'm in a very small-stakes NL game on UB. On the SB I have QQ. Three people see the flop which is Q6x with two hearts. I checkraise all in. While player 2 is deciding to call, player 3 tells him not to. They then begin a discussion of whether or not I’m on a draw. Player 2 finally folds and player 3 calls. Turns out he had pocket sixes for a set of sixes.

While I’m certainly not claiming they were colluding (hopefully no one is that stupid to try and collude via table chat) I don’t particularly appreciate someone who thinks he has me beat telling another guy who isn’t sure not to call me. At one point player 3 did say “I have it” but I can’t remember if that was before or after player 2 folded. At the very least this seems to violate the “no speculation” rule. Am I wrong to be upset? I feel reasonably certain this would be frowned upon at a casino. Is this just a case of someone so stupid as to flop a set of sixes and tell someone else not to put a lot of money in the pot. (He is that stupid btw as he called two of my all-ins with a 3 outer and a 6 outer and of course hit both. The sucking out doesn’t bother me but costing me money by telling someone else not to bet does).