everyone being nude there are no barriers rich, poor, smart , dumb
I have not found that to be true. Smart and dumb come out in any conversation, clothed or nude. And rich and poor are shown by the vehicles people drive and the buildings where they live, both of which can be apparent in nudist situations.
I am not a different person at all when nude. I can sit down in a university library, clothed of course, and do advanced academic work. Or, I can sit at my computer at home, nude, and do the same advanced academic work. The same applies when I am outdoors making observations: whether I am clothed or nude is determined by my judgement about how likely I am to be seen, but it doesn't affect the observations I make.
Not to put too fine a point on it: if who you are changes according to whether you are clothed or nude, doesn't that belie the premise of naturism, i.e. that clothes or lack thereof is mainly a practical consideration?
Like another responder, I'm introvert anyway - always the loner in any gathering - and far better when writing than when trying to make conversation. Being naked doesn't change this as far as I can judge (others would have to decide this). What I do want to add, however, is the experience some years ago now of holding a birthday party (it's more a Dutch tradition) at which everyone (about 12 of us , men only but not gay only, nothing erotic therefore), after aperitifs in beach clothing (swimwear, just to ease people into the concept), stripped naked and they massaged each other. After the massage exchanges everyone stayed naked for the rest of the evening (refreshments, drinks). The point of this story is, however, that several commented that they found it easier to chat with people when naked: any inhibitions seemed to disappear along with the clothes. Not everyone there was naturist (obviously no problem getting naked in this situation, but not necessarily in life in general), so it was quite a revelation to them that this was the case. That massages had been shared will have helped, but it was the nudity that people noticed as making a difference. The atmosphere at an annual massage and sauna day I organize for ex-students (of my massage courses) is always excellent and many say on such occasions that this is partly, or even mainly, because everyone's totally naked all the time (the totally bit means no towels, bathrobes etc., either). That's with around 50 guys, mostly gay, in a sauna.
The direct answer to the question seems then to be that people can be different when naked, and usually more relaxed and gregarious. I guess it's 'we're all in the same boat' that helps. It's also possible that people who are either always happier when nude or at least don't mind stripping off completely when the occasion is appropriate are in any case more sociable, open people. But this might be nonsense and I'm not a sociologist.
I like to think Im the same person with or without clothes, and think that inner nudity of sharing something potentially vulnerable is more difficult than taking of my clothes. In Sweden I enjoyed chatting with people I didnt know in the local swimming pool sauna divided by gender, generally no clothes. Sweden is the kind of culture you dont talk with strangers unless you are drunk, mentally ill, a foreigner or some combination of the above. Saunas are an exception.
Im pretty tall and hairy and unsure if being naked makes me more imposing or authentic. Ive made friends from saunas and spas in the states, single dads like me, along with interesting conversations. Once I talked with a millennial about his extensive tattoos and it was like getting a tour at an art museum: open, honest and free of sexual overtones. As a single dad, Im at a stage in life where I dont have much opportunity to make love naked, so Ill settle for making conversation naked, and its all good.