They say stupidity is an advantage of a person.Is this true?

Stupidity is just a part of one's mentality. People form an opinion of others based on the way the act, speak, and basically just live. If you act stupid, it won't help you get anywhere in life because no one will want to associate with you or be around you. If you live your life doing stupid, foolish things, again, no one wants to be around you. Some would fear for their safety if they were around you. Being stupid is not a good thing, especially if you deliberately act that way.