"Exactly!" Strange responds, with an aggravated hrmph. "Why would someone ruin a perfectly fine pizza by putting pineapple on it?"

This is obviously a point of consternation as Strange just looks at the pizza like it has somehow personally offended him. Urgh, and the pizzas sitting next to it probably smell like pineapple also.

As Strange is too busy whining about the existence of pineapple, he's not paying any attention to Francis.