Dave,
I would find your experiences despicable, and would have supported you and certainly not joined in with the abuse.
I would also not suggest that you just accept it and "get over it."

I did have a fake profile of me put up by some far right persons. Richard Bridge helped me deal with it.

the organisation that arranged it has now mutated into one that you defend vigourously.

I assume you mean Ukip.
I do not "defend them vigorously" but as they have no defenders here I do point out untruths spoken about them. That is all.

I think your claim that some unpleasant organisation mutated into them is such an untruth, or have you evidence?

I do not find it trivial to be falsely accused of nasty things.
I find it deeply offensive, and I doubt that many people would find it "trivial in the extreme" either.

I think most people would find such behaviour despicable, and question the motivation of those doing it.

Instead of suggesting I ignore it you should stop doing it yourself and suggest that your friends stop too.