I do this in real life too actually, it's usually fun to tell people I don't touch fists. A lot of times they just leave it hanging there for a long time trying to make it happen.

Though one time I found a guy who got beaten up outside a bar in a barfight(I am barfight patrol). He asked me if he did good in the fight. He didn't do good but I told him he did and I let him fistbump me.