Mentors comes in so many different ways. The best ones I've seen stopped helping in public. The same reason I mentioned, people will be more toxic when there is no parser.
You mention people getting kicked from duty finder. On their first try. Have you read the threads on these forums? Many mentors doesn't even stay when it's a low level roulette on their mentor roulette, there is many ''mentors'' who kick people for being new too, so there goes the mentors are great people. I'm not saying all of them are bad, but they exist, in a larger amount than it should be. People get kicked for everything in dungeons these days and do they have a parser? Hell no. If a BRD who is lvl 60 in a expert roulette or a smn doing 1.2k dps and a whm lets say does 1.5k, can you explain to me why the smn is this low? I mean I've been through dungeons where dps is insanely low and I never kick them but I rather stay and help them out. I've gotten good feedbacks but most of the time sadly bad ones. The bad ones usually have an attitude and I kick them, why? They harrasing me so why not?
Quoting you here: ''if you are afraid to recive a bad response for any reason then meaby the sensitive its you'' Sensetive? It's not, it's actually funny how awkward offended they get when I tell them how certain things works and how they should do things if I see something wrong. They get so over sensetive they think I'm offending me, that's the issue and it's funny because you mention people might be too senstive about it. The whole thread is a parser and most are againt's it because they are sensetive about it..
If 8 out of 10 players gets ''offended'' by a smile and some advice, does it motivate me? Or others? Not really. They need to fix their own attitude. A parser would tell them and we don't have to, like I've mentioned already. As long the info is right in front of them, they need to understand that what they been doing is wrong the entire time and some people ACTUALLY try to help out.