Well, we are all writers of one sort or another, which is why I thought the critique forum would be a friendlier place than it is. But it's only a small number of posters that are unecessarily rude.
For my part, I have no lasting animosity towards anyone on here.
I think constructive criticism (whether you like or dislike a piece for whatever reason) should basically be polite. If it isn't then you have to doubt the sincerity of the poster as you cannot be sure of their motive, which sort of defeats the objective of them bothering to respond.
If I ever put anything in critique again, it may have the tag: "If you are going to be rude or off hand, don't bother posting, whether you like the piece or not, as I will not know if I can value your opininon and so you would be wasting your time"
I am not looking for sycophancy, a polite "It's not funny for me" or "I don't like it, it's not well written because...." will always be well received and in fact welcomed.