Brat

A person who incessantly craves attention and basks in the limelight, often flaunting their ignorance and seeking outrageous reactions. They are generally embarrassing and intolerable to be around.

Examples:

• " When I saw Jen prancing around the party, singing the national anthem in falsetto while topless, I knew she was a full-blown brat "
• " The brat on the subway yelled at the bus driver for not stopping for his side of the road, causing a scene that lasted 10 minutes "
• " She posted a photo of her mediocre spicy chicken sandwich on Instagram with 27 filters, proving she's just a brat who wants likes "