Not cool, bro.

A 20-year-old Outer Sunset district man who allegedly hit his sister in the stomach because he wanted the volume to the television higher was cited for battery Saturday.

The sister, an 18-year-old woman, marched to Taraval Station to report the mid-afternoon assault, police at Taraval Station said.

Cops went to the residence in the 2500 block of 46th Avenue, where the brother confirmed the statement.

Apparently the sister wanted to lower the TV’s volume, angering her sibling, police said.

A judge issued an emergency protective order to protect the sister, police said.

maldax@sfexaminer.com