Sadly, to a certain extent, Jazz and Noelle are kind of products of their generation which doesn't remember and probably cannot fathom life without social media and constant internet access. I personally think that in addition to the hormone blockers, social media in many ways has contributed to Jazz and his ilk (and many non-troon kids of this generation as well) being socially stunted.
Those of us who graduated high school and came of age before about 2010 or so (I graduated in 2006), think back for a minute. We all remember that kid or group of kids in junior high or high school that just HAD to be different to get attention. They may have purposely espoused unpopular opinions, dressed strangely or inappropriately, dyed their hair stupid colors, etc. When nobody paid attention or lost interest in one of their antics, they moved onto the next gimmick, and the next, and the next, not unlike a munchie cycling through "diseases". Such kids were often not well-liked because it was obvious that the only statement they were making was "Look at me! I'm a non-conformist! Fuck society!". No one saw them as cool or edgy or activists, just harmless but annoying pains in the ass. Now think back to those same kids during the last few years of high school. Most of them weren't doing those things anymore, were they? And if they were, they did so on a much smaller level. It was like sometime during the summer between junior and senior year, they had an epiphany and realized that dying their hair turquoise or dressing in all black all the time wasn't going to get them very far as they looked toward their future. Such changes could also have come about more practically, such as wanting to get a particular job but finding out that their unnatural hair color violated the dress code policy and deciding "A paycheck is more important than turquoise hair. I'll go back to my natural color and wearing more appropriate clothes.". Most of us from these generations have no memory of doing these thing ourselves because — barring some type of obvious developmental disability or delay — such epiphanies were generally seen as a given. It's called maturation or growing up. There was no choice but to straighten up and fly right. We certainly weren't fully mature by any means at 18 or 19, but we at least had some of the basics or were in the process of learning them.
The current Tumblr generation doesn't seem to achieve this milestone of "putting away their childhood toys", so to speak. Or if they do, it's much later than we ever did. Because they have constant access to the internet and social media, they don't learn to listen to and consider others' opinions and feelings because they know that whenever something doesn't go their way, they can just whip out their phone, go onto Tumblr or any other echo chamber and get instant validation. They're not learning as we did that life isn't fair and that sometimes you just have to deal with disappointment and get over it. Parents don't put their foot down anymore because "experts" label them as abusers if they do. These kids never learn how to view the world in shades of gray because Tumblr paints everything as a dichotomy ("If you don't agree with everything I say, you're an oppressor and we can never be friends."). This stunts most kids anyway, but because of Jazz being put on puberty blockers, she is frozen at about 9 or 10 whereas most Tumblrinas seem closer to 14 or 15.
TL/DR: Constant social media seems to be stunting the development of younger people because they can retreat into their echo chamber at any time instead of actually facing life's challenges and learning healthy coping mechanisms like previous generations had to.