You do love a stereotype, don't you?
Perhaps you should get out more and get to know people before commenting.
For starters, the St James' Park atmosphere is, like Anfield's, something of a myth. But even if it wasn't, your theory is based on...........well, nothing of any substance.
You're merely guessing as to the social make up of the St James' Park crowd. For that matter, it appears that you're guessing as to the social make up of the White Hart Lane crowd too. Are there many middle class fans who attend games at White Hart Lane? Certainly. But there are many middle class fans who attend games at St James' Park too. And if there was any substance to your theory, clubs like Wigan, Bolton, Blackburn etc (who really don't attract much by way of middle class support) would be heaving bearpits of noise. But they're not. Quite the opposite.
Even more pertinently, you're guessing as to the supporting habits of middle class and working class fans. As I've already told you, our middle class group of fans is far more vocal and passionate than any of the fans that have sat around us in 20 years of having a season ticket in various parts of the ground.
If there is a distinction to be made about supporting habits, I suspect that age is far more important than class. It's something of a generalisation but, for many long serving fans, there comes a time when they feel that they have done their bit in terms of supporting the team and that it isn't really becoming for them to be singing and jumping around any more. So they stop and leave all that sort of thing to the younger generation of fans. The only problem is that, at White Hart Lane, there are fewer and fewer of those. Two reasons:
1. Limited capacity - many young fans simply can't get tickets because the older fans have them sewn up.
2. Ticket prices - most young fans simply can't afford season tickets at WHL now.
Anyway, let's not take this thread off track. Whatever our fans' background, what's important is that they start to support the team properly once again.