Tartare… Don’t people know how to spell anymore???
Oh, silly me… of course they don’t, the rigidity of primary school rote learning was considered to be an offense against human rights. Cruel it was, boring it was, BUT AT LEAST I CAN WRITE COHERENTLY AND ELOQUENTLY!!
Tarter, however, is a comparison adjective meaning something is more tart than another thing, and I strongly doubt that that is what he meant, so the good news is: he’s still wrong! Huzzah! We are still superior!