Why do people hate verbing nouns so much?

I've never figured this out. English has been doing it since at least the Middle English period (1100–1450).

And why can't you talk about verbing nouns without using the noun verb as a verb?

You can call them denominal verbs if, like me, you were so inclined. There are deadjectival verbs, too, and deverbal nouns.

Ceci n'est pas un seing.