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cringe in english simply doesn't exist.
if english isn't your first language you probably know what I'm talking about. like, when you say something in english it sounds completely fine but then you say exactly the same thing in your native language and just.... eww...
so we all know that yamada is pretty fluent in english (otherwise he wouldn't become a teacher, right?) and he probably was really good in it at his school years. so he started to use more and more phrases or even say whole sentences in english and what he was saying became progressively cringe over passing time.
my point is yamada hizashi is a man who actively slaughter cringe culture every single day for 30 years and you can't change my mind.
aizawa who was hanging out with yamada and shirakumo during ua time become completely blind to cringe. am i talking about his fashion choices? ... maybe.