Is there a difference between this and snobbery?

In the first year of high school, our music teacher suggested the whole class would come with her and see an opera at the Finnish National Opera. I was really against the idea, because coming from a working class background, my idea of opera at that point was that it was incomprehensible art for poshly dressed upper class people. In the end she managed to convince me to come, though. I even tried to wear my best clothes, which at that time meant a neutral-coloured wool sweater and clean black jeans. The opera (or operetta, to be precise) in question was Strauss's Die Fledermaus, which is quite funny and entertaining, so after the first half I was ready to scrap my prejudices against the opera... But during the intermission the teacher came to me and scolded me for having eaten sweets during the show!

Like the boor that I was, I'd thought it'd be perfectly fine to bring a bag of sweets to the opera, and the teacher had seen me eat them. And it was not like they made any noise or anything, I'd picked only sweets without a wrapper, and they were in a plastic bag. But apparently to her, the mere idea of eating sweets in the opera was unacceptable! I felt a bit ashamed, but mostly just angered, by her reaction. Way to convince an opera sceptic, teacher!

(The postscript to this story happened years later, when me and some friends went to see The Magic Flute in the Czech National Opera, and I noticed that during the intermission, alongside the posh wines and tarts, they were also selling Mentos! By then it'd been ages since I graduated from high school, but I felt like taking a photo of the Mentos on sale, finding that music teacher's address, and mailing the pic to her, with a note saying, "SEE?".)

13-15 year olds are terrific snobs, but instead of opera or French cooking they are snobbish about the things that only 13-15 year olds care about.

the first time i can remember was after having joined prep school and some kids were discussing their visit to the house of another kid who was from a lower middle class 'model minority' type of south asian family whose parents were probably making a sacrifice to send their son to the school and were significantly less well-to-do than everyone else

they were laughing at how small and shitty his house was in a way that seemed extraordinarily caustic and unashamed, it was a useful education in the attitudes of the place

A lot of these seem like inversions of the situation described in first post of this thread

In my early teens i knocked about with an upper middle class kid called Edwin who confessed to me his mother had referred to me as "coming from that appalling Irish family" when telling him to stay clear of me. Also when I switched schools years before this, I was ashamed to admit I came from Deighton and used to answer evasively if somebody asked where I lived - constantly trying to change Deighton into south Fixby or west Bradley.