a spade has to be called a spade, and a moron has to be called a moron

These rules are not of a kind. In the former case, you have something that's indisputably a (shovel|playing card suit) and call it by its name. In the latter case, you likely don't have very solid grounds for identifying a person as a 'moron' (we're talking about Internet exchanges, right?) and the term isn't very well-defined in the first place.

If you're administering early 20th-century IQ tests then you have good reason to be calling people morons; otherwise, no.