This isn't my experience at all.
There are posters I interact with on these boards who are always positive about the RPGs they're playing, the techniques they're using, the different experiences they're enjoying. And they very often have new insights. Interacting with these posters has had a huge, positive, impact on my own RPGing.
Yeah, this concept of negativity-by-way-of-toxic-positivity is alien to me both in physical aspects of my real life and my gaming life.
Life is pretty damn mentally challenging in a myriad of ways as-is. And filled with pain and loss. And over before you know it. Give me infectious positivity (including someone with a persistent, infectious, genuine smile and an easy laugh) and micro-focus, belief/purpose all day any day, please (I could personally use the offset…I don’t need amplification of my own worst tendencies). The climbing community and martial arts community are generally filled with happy and healthy people. Being around them is rejuvenating and invigorating. That is not a happy accident.
Like you, my interactions with particular posters breaking down systems/techniques they love and analyzing their own play excerpts to break them down for others (and expose areas where they could improve) is extremely positive, rewarding and helpful to my TTRPG experience. Running games for (at that point) strangers in games they have low familiarity with to experience their joy is an extremely rewarding, positive experience.
What isn’t rewarding is all the negativity with scorched earth, 6+ year edition warring against 4e being the absolute zenith…the absolute mother load (here, social media, at game stores, randomly IRL). What isn’t rewarding is all the negativity that some GMs on here routinely express about
how much their players suck and
how much those players wreck their games. Don’t know where all of these terrible players are (I don’t run into them and I run games for a lot of people…I guess that makes me toxically positive!), but apparently the hobby is full of them given the breadth and vigor of the testimony!