First of all, if I had a pizza joint he'd be hired immediately (pineapple on pizza is fine, but it's something you should do in a private place, like masturbating)

Secondly, I like anchovies on my pizza and I'm not a ninja turtle, so do whatever you want with my opinion.

Fun tip: if you find yourself at a pizza joint that serves pineapple pizza, ask if they can also add anchovies as well. If they say "no, we don't carry anchovies", that's your cue to bring out the can of which you brought along, peel that stinky bastard open, sit it on the table with grace & prestige and say with a condescending tone "It's fine, I brought my own..."

pineapple on pizza was "offensive"

Stop being a pretentious twat and do your job or get sacked for refusing to do it.