@Indigo911 yes there is a lot of judgement from sexworkers towards clients too - and what tends to happen there is that they don't get a lot of repeat business when clients learn what they've said about them. A really good sexworker keeps that to themselves, although to be honest, when people work in jobs that aren't the sex industry, they tend to moan about work and clients too. It's totally normal. Everyone needs somewhere to moan about bad experiences.
I kept away from SAAFE and other places for that reason. Unfortunately, just as any other place of work, there will always be an air of bitchiness when people don't get along.
Competitiveness is a bastard, and yes it's rampant in sexwork.
You're right - UK Punting has some deeply unpleasant talk on it, which is also why a lot of sexworkers keep away from it to maintain their sanity. Screening processes are a must - to ensure safety and security. A couple of sites exist that have feedback ratings for clients so that a sexworker can decide if someone is safe or someone they want to see, or not. Vetting processes are everything.
The thing is, if people were less critical towards sexworkers and accepted that sexwork is valid and exists as a money source for many, then perhaps people might treat them with more respect on the whole. We have policies for harassment and proper treatment of people in mainstream employment, so why should sexworkers be any less deserving?