Why are IITians so egoistic and annoying (Rant)

So obviously I prepared for jee, joined coaching etc and didn't perform well in jee adv but was able to get a decent new Delhi college (one of those popular ones). The middle months after jee and before college started were a bit sad, but I was able to fit in well in my first year itself. Few of my classmates from school/coaching got into iits but I lost touch with them, but I remember they were humble and normal when I studied with them. But in my college years, when I attended fests or met with any iit peeps in some competitions or stuff, there was always a strong ego vibe coming from them, even when I met up with a coaching classmate who was humble in the beginning, was totally changed after being in iit. And like, I can understand having some ego if you've achieved something materialistic like getting a big job. But why do the ones who have achieved literally nothing in iits also have so much ego?? For nothing literally. I've never met a humble iit student who has not mentioned 'iit' in every second sentence. Mostly referring to btechs here, cuz the mtechs/PhDs still feel fine and welcoming. I fr thought all these feelings might be because of some inner dissatisfaction that I didn't get into iit. But even after passing out college, getting a good job and seeing things from a neutral perspective,they still feel the same.