Just to point out the obvious, something can be generally true even if it is not true for millions of people.
Of those millions with great high paying jobs, how many feel they still exist within a safe harbor. From my experience not even FANG employees in general feel that and there are not millions of those - we're really only counting Engineers not Amazon Wearhouse workers who are clearly a part of the working poor. Also the middle class is not what it used to be, in relative terms Tech is great, but what you may consider great high paying job I might consider a middle class job in historical terms and what you consider middle class I might consider working poor. Things really are getting worse, it's not just a meme.
A single example does not make for a generalization.
I don't know where you are getting $400K from. The median yearly total compensation reported at Netflix is $375,000 which is famous even within FANG for it's high comp.
Microsoft Average total comp for Engineers is $177K from leaked data. That's the average, with the expected distribution I would expect median would be lower. Say ~$140K.
And yeah, ~$140K total comp is a middle class to me. Upper class is when you don't have to work to live anymore.
People remember higher numbers more because they covet them, but they tend to ignore a huge sea lower numbers that exists on average.
I stated with a generalization, if you intend to counter that you should probably pick an exemplar of a generalization yourself. Otherwise you're not even wrong - what you're doing makes zero logical sense. Even if I were to say that yes a person making $400K is reasonably well off and should feel secure in their finances that is still does not counter my generalization.
Of those millions with great high paying jobs, how many feel they still exist within a safe harbor. From my experience not even FANG employees in general feel that and there are not millions of those - we're really only counting Engineers not Amazon Wearhouse workers who are clearly a part of the working poor. Also the middle class is not what it used to be, in relative terms Tech is great, but what you may consider great high paying job I might consider a middle class job in historical terms and what you consider middle class I might consider working poor. Things really are getting worse, it's not just a meme.