TLIK, you paint with far too broad a brush.
Also, your reference to “today’s generation” is surprising, since, as a rule, today’s Mechanchim are very warm and encouraging (If anything, the culture of prizes and rewards has gone too far, but that’s another discussion). In general, today’s Mechanchim are trained to minimize punitive measures, and, when they are necessary, to implement them in a way which does not jeopardize their relationship with their students.