When that song came out and got much radio play, it wasn't interpreted as a joke but rather an opinion many shared condescendingly.
What younger people in this era won't understand is until the mid 1980s when immigration exploded and it became increasingly politically incorrect to be critical of immigrants, many of which were shorter than average white Caucasians, there was a huge cultural bias against short men that was present at all ages growing up and rampant in workplaces where most men chosen for management roles were also the tallest. That was most true for sales positions. In the military at basic training, the shortest men were instantly assigned as permanent "road guards with flashlights" for marching around while tallest were made group leads. At social events, the last thing girls with any better social status would do is be seen dancing with any shorter boys to the extent short girls were also embarrassed to dance with shorter men. At retail clothing stores the shortest or smallest sizes were invariably the plainest with fewest lengths. Much more books have been written over. Amazingly how quickly that all changed.