Have you ever seen someone bragging about their educational background??

I have never seen it. That's why I don't understand why people say bragging about your academic background is meaningless.
It's because I've never seen anyone like that. On the contrary, I've seen people with great academic backgrounds who are running their own businesses, which felt a bit odd, and I've seen people who don't mention their prestigious degrees at all... only to find out later through conversation that they graduated from Seoul National University.