what I should have said to the guy

.......and no, you ignorant mother fucker, the paste is called Tahini paste not Tahiti paste, what you are tasting you ignorant bastard is sesame not mango, you fricken moron. And when you say ignorant things it is not because you had less opportunity than I for an education it is simply you choose to represent yourself as an intelligent being and supporting it with thought not only unintelligent but almost from a childlike ignorance destroys your point long before it has left your lips.

and that is what I should have said. Instead I just looked away and ignored him.