The only advantage Sans had over everyone else is that he was allowed to hurt and maim as he pleased to prove a point and enforce security. Thankfully for Joker this was not the case for Tyki. If an attack happened against him he would likely react regardless out of pure hate. Being punched would receive a punch. Being manipulated mentally would result in aggression. The fact Joker was so calm infuriated him.

He should be reacting and yet he was not. Joker could just feel the way he was gripping that fabric a little harder with a faint twitch to his fingertips. Even if he's not allowed to let it be known he wants to.

"You should know as well as anyone that I play to favor and my hand is always loaded with the best results." He's not showing emotion just yet as Joker starts showing his hand as well, "Extremely. The Prince offered me a better hand and I took it. I enjoy nothing more right now."