Ronnie Lott -- Aaron Rodgers Should 'Man Up' ... WEAR 49ers JERSEY!!!!

Green Bay Packers QB Aaron Rodgers needs to "man up" and stop trying to weasel out of the bet he made with Boyz II Men ... this according to NFL Hall of Famer Ronnie Lott. Lott is no stranger to friendly wagers -- the 49ers legend tells us he used…