A YouTube video shows Abdassamad Haidour berating King Mohammed as he addressed a gaggle of people in the street.
The protests are the latest in a series of peaceful demonstrations by the youth-led opposition February 20 Movement.
Morocco`s King can dissolve Parliament if it proposes laws that do not please him.
Day in Pics: 19th December
Showbiz World - December 19, 2014
People Magazine Awards 2014