Bill Cosby is no stranger to criticizing other comedians, but in the 1970s, he allegedly found himself on the receiving end of a little criticism of his own. Who would’ve had the nerve to go after Cosby at that stage in his career, you ask? Well, as it turns out, Tom Smothers, one-half of the popular Smothers Brothers comedy team, was one of Cosby’s most vocal detractors in those days. By most accounts, the two didn’t care for one another at all…