What's the point of being humble? Meanwhile people out there shittalk you, take advantage of you, why? They know you won't fight back anyway, you made yourself look weak. At that point isn't that just stupid, can you even call this humble?
In every major religion there exists the so-called "golden rule": treat others like you want to be treated. This is a core value that billions across the globe strive to perfect in their lives, and for good reason. Even if you're not religious it's a very good rule to try to follow.
Why should you be humble? Well, let me answer your question with a question: would you rather be around those who are humble than not? If so, then be humble! Or at least try to be :)