A question for the anime community

Why do you gatekeep anime? Like what kind of satisfaction do you get from gate keeping anime?

Their was this one time where i was watching aot in the bus and i guy came up to me and said “oh you watch aot you probably watch for the hype i bet you simp for levi and eren you probably never heard of naruto and one piece go back to watching riverdale and stranger things” umm- first of all i had been watching aot since 2014 and I believe in the H A N G E SUPREMACY and lastly your opinion aint valid if you wearing a ahegao hoodie and sweatpants the second hand embarrassment i felt was astronomical lowkey wanted to punch the guys for telling me what and what not to watch

If yall dont know what a ahegao hoodie is here it is
https://images.app.goo.gl/3pauhUkDULLvE362A