LOL, the charging handle is left handed. If you are a lefty try putting the stock/pistol brace to your shoulder, grasp the charging handle with your left index finger and thumb, and pull to the rear. The release for the charging handle is on the left side and can be easily manipulated with only one finger. I do not need to bring the rifle/carbine/pistol down to charge the bolt on an AR.
As far as "You must have sensitive ears or not used to loud firearms?", I spent over 30 years in the Army, between work as a helicopter crew chief, mechanized infantry platoon leader, mortar platoon leader, company commander, and numerous other jobs around .50 cal M2, .30 cal M60, 25 mm Bushmaster, tanks, armored personnel carriers (both tracked and wheeled), rockets/missiles, artillery (both incoming and outgoing), etc., I am surprised that I still have any hearing left. If you think a SBR in 5.56mm NATO is not loud you must be close to deaf.
But if you want to push the point, I suggest you shoot one inside a closed room, that should give you a new perspective, unless you really are deaf.