The hand on Kenzi's arm is enough to keep her from really laying into Eames. When he mentions 'naive' Kenzi has to laugh because - really?

"I'm sorry, did we come here for a lecture?"

She'll keep it at that. Let Abigail be the one to really lay into him if she wanted it to go there. Kenzi would just take her dinner in a doggie bag and leave it at that.