Why is a bearded dragon mean?

When a bearded dragon gets scared, a pouch near the throat inflates and darkens, so as to intimidate the foe. They also look like small dragons.

Also the beardie is showing off. My beardie looks at himself while he is sunbathing and just blows out his beard to show how strong or good he looks. He loves me to talk to him when he does it. He is so funny !