Yes indeed he has...
I recall Jon mentioning that he had a poor experience on a website where he was treated badly. It also explains his relaxed attitude with posters --- before I became a moderator I was of the opinion that difficult people should be banned, based on the idea that the constant stirrers, I'm sure you can think of some on here!
The constant stirrers create a lot of work for the moderators so even though they've got free speech, moderators don't have the time to babysit and sort out the mess they cause. The easiest option is a ban, but Jon is against that, and I reluctantly followed his wishes.. I refrained from banning certain people, even though every fibre of my being demanded it!!
I've come to realise over the years that Jon's right.... there are some notable people who were once entrenched and diabolical trolls who are now actually semi-human and they exist on this site!!! --- they can't help having a little stir now and again but --- I look on it with amusement!!!