I'm sure there are hobbyists out there who do just the opposite.

even the majority attitude. But many providers are treated very poorly by many hobbyists. And vice versa. Many of us have many "issues" that have been handed down to us regarding human sexuality. These implicit ideas often lead to us treating one another rather poorly.

While it may be puzzling, reminding people to treat each other well, and respectfully, is never a bad idea, I think. You just can't have too much of good treatment in the world.

I've never seen it though; typically it is along the lines of "don't see her"

The whole "treat her well" thing is harmless enough; I doubt it changes anyone's mind about how they treat her when they do see her though.

When someone says that, it means they were careful to mind the rules and be a gentleman.  And during the session, perhaps they received services they were not expecting.  Or the session was particularly hot.  That's what it means.  The provider exceeded expectations on some level, and the reviewer perceives the added attention as the "thank you" for being courteous.

It lets the reviewer be a White Knight.

I thought we supposed to treat everyone with respect.  My bad!