Does Having A Karate Black Belt Mean You Are Tough?

Is there anything more overrated than a black belt?  Granted I’ve never met a person who has a black belt or anyone who practices karate, but it just seems so over-rated.   It’s more for show.  Kind of like that fight dance thing Pres loves from Only the Strong.    So I guess my question is what’s’ the point?  If you’re going to spend all that time training why not train for something that would actually help in a street fight.