The Real Slim Shady, you show an incredible lack of knowledge and maturity. Wonder what you would have posted if the controller had given immediate descent slap bang into some other traffic. Rest assured my friend that no controller will deliberately make you ride heavy turbulence just for the fun of it. Try and understand that if an aircraft in the cruise unexpectantly requests descent the controller may well first have to initiate co-ordination with an adjacent sector or unit. Spend a day in an en-route ATC centre before you mouth off so stupidly.
Kick the tires, by all means call "Mayday - am descending to FL200". Then it's your responsibility. But if you "request" descent the controller will not move you until he/she is satisfied that it is safe to do so and all necessary co-ordination has been effected - because it's his/her responsibility.