To answer the last question first, I don't pay attention to other eaters. I am only bothered when some right-handed person is sitting to my left. I'm left-handed you see...I am also annoyed during get-togethers and parties because once it gets out that I don't drink I am bombarded with the, 'why' question.
Anyway, on to the Pizza!!
In my area, we have the NY style pizza. Deep Dish is available but we never get it at my house because nobody here cares about the foods I enjoy eating. Not that it matters, 9 out of 10 times I'll eat pizza by hand. Once I get near the crust, I turn the thing sideways so as to get crust-and-pizza-bits in each bite. That other 1/10 of the time, I'll roll the slice up and eat it like that. That only really works for the New Yorkiest of the New York style pizzas.