Positive people and negative humor

Generally, “negativity” is regarded, socially, as a character flaw. You are supposed to focus on the bright side, never complain, never be too realistic, etc. Every post, or self help book, or resource about socializing tells you to avoid negativity, but then they also tell you to be genuine. It’s like, make up your mind!

Obviously, if you go around just straight up moaning and ranting, it’s a bummer. But how do positive, bubbly people feel about things like sarcasm, and using humor to call attention to the stupidity and annoyances of the world? Do glass-half-empty, cynical types get a free pass to be pessimistic and critical as long as it’s funny?

Would love to hear any opinions or experiences!