You have never met a TCS-raised child. Why do you think that TCS, which you have never encountered, will without doubt produce this stereotype of teenager, which you have encountered often?
I live in one of the richest counties in the US. (formerly #1 actually). I see children raised like this ALL THE TIME. It is far more common to see a parent explaining themselves to a child who is throwing a tantrum than it is to see a parent putting their foot down. These children grow up totally unprepared for a world that does not make every concession to their current mood. With the exception of the ones who have trust funds (quite a lot around here) and thus don't ever have to face the real world, these kids almost universally wind up as only semi-functioning adults.
I'd go so far as to say that it is inflicting environmental retardation on your child. You job as a parent isn't to be your child's friend. It is to socialize them and prepare them for life. If you want to be friends, you'll have to wait until they're an adult.
I don't think I'd want to be friends with a person who had hurt and coerced me all my life. As for socializing, 'no man can use his brain to think for another man'. A parent can't socialize their child. The child must socialize themselves. The parent can only either persuade their child, trying to help them, or else coerce them, that is, harm them.
One of these is the attitude of a human, the other of a monstrous tyrant. It is always alarming to hear a person say that for the individual, tyranny is the only way to a successful outcome, when time and time again it has wrecked whole societies who together were unable to withstand its corrosive effects.