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.
If you're trying to say a FANG employee making 400k in the US doesn't feel safe we'd have to dig into that.