I don't think this elitism is the biggest reason people quit social media. Quitting social media has bigger consequences for elitist mindsets-- that is, having a social media presence involves more opportunity to curate an image that is seen by others as "elite".
This kind of thinking is also a coping mechanism. Going against common practice is isolating but if you can think of it as elevating or distinguishing then you can more easily accomplish your goals or follow through with what you're thinking and feeling on a particular issue. It's hard to quit social media, even if it's no longer benefiting you.
So, ultimately, your complaints of this kind of elitism are pointless and change nothing. They say nothing valuable about the state of the world or the state of this change.