In a personal improvement course I am taking it says that "Sarcasm is society's acceptable form of emotional abuse." (Hu D. SM)
Believe me, there is a lot of hatred in me right now for that form of communication.
It's impersonal, indirect, meant to take people on a joy ride for their own (the one dishing it out) enjoyment at the others' expense.
People who communicate with innuendo's are not genuine and are IMHO (In My Humble Opinion) just plain mean.