I get it that voltage drop across active loads are less compared to passive loads and at the same time they offer high small signal impedance thereby increasing gain.

I cannot understand why DC voltage drop across them is lower compared to passive loads like resistors. 

In the book "Fundamentals of Microelectronics" by Prof. Behzad Razavi, it's written that active loads don't follow Ohm's law like resistors. Okay I agree but still I don't get why the DC voltage drop across an active load will be lower.