But worse for your knees...
Grab a copy of a basic barbell weightlifting book, and you'll see - it'll say the same thing.
Most people from Asia are able to squat pretty comfortably, comfortably as in heel on the ground and not exerting any calf or knee tension, having done it since childhood. Most Western Europeans and Americans can no, the heel of the foot doesn't rest on the ground and squatting is done on the ball of the foot therefore calf and knee pressure.