Is it normal i'm the third wheel amongst my two friends?

So one time my friend said she likes chalky potatoes and another friend said that she likes floury potatoes. I said I like cheesy potatoes and they just laughed at me and said it's not a type of potato.

One time one friend said she likes red tomatoes and another friend said she likes green tomatoes and I said I like both tomatoes and they said there's no such thing as "both" tomatoes. Then they laughed out of their mouth-holes at me.

Last night, the first friend said she likes it in the butt, and my second friend said she likes it in the face. So I made a fist and punched the first one in the butt, the second one in the face and I ran away laughing because I like fisting.