It sounds like some people are not happy with the sledging.
As I have said before, sledging is a favorite Australian pastime for when things get dull and boring, and so long as it's not done spitefully or vindictively then there is no harm in it.
Nobody is immune. You do it to your best mates.
The only areas that are "no go" zones are your wife, your kids, and your dog. (probably in reverse order)
Some of the sledging has an element of truth to it and I sometimes recognise myself in the descriptions. This amuses me more than offends me.
I'm in the group that User and others most commonly sledge, old and well worn, dragging the dregs out of my beaten up old dogs body with a bit of bogging back and forwards on not too wild and windy days.
I'm not offended by it at all. (the sledging that is. I am offended that I am old and worn out but it's still better than the alternative.

)
On this forum most of us use screen names, thus when someone is sledged, it is for the most part anonymous.
I would not agree to any serious slandering if it was directed towards a proper named person, but I never see that here.
Consistent with this, I think the thread to find a new avatar for User is one of the funniest I have seen for a long time and unless he is particularly thin skinned, I think he would probably agree.
I can't imagine he is thin skinned because he keeps coming back for another caning.
I agree that many people might get tired of it after a while, but when they do, it's really easy not to click on the heading. It's not like anyone is forced to tune in. There are lots of threads that I have a quick look at and then don't go back to. I suggest they do the same.
It would be a bit sad to find all the forum sanitised to the point of boredom to avoid offence to the overly sensitive.
SUMMARY
Things are fine as they stand so long as the posts are not obviously meant to be spiteful and/or vindictive or directed towards a known person.
Laurie, I think your original assessment;
" I've been following the "user" topic with interest, and from where I stood it looked like some good to & fro banter. The windsurfing fraternity have always been solid in their conviction and not bothered by pimps, trolls or kiters.
There's no wind, and I saw it as everybody having fun?" is spot on so in my view, leave as is.