No omginternets, you are wrong here. Heightism and racism really is the same thing. If someone who is 160 cm doesn't get the manager job because however is recruiting don't believe his subordinates would respect him because of his lack of stature, then that is just as bad as a black person would't get the manager job because perhaps his subordinates don't respect black people. The point is how limiting the discrimination is, not whatever the historical background was.

In many countries, some jobs are de facto unavailable to short men. Next time you visit a schoolyard. See who the bullied kids are. They might have something in common. It might not be their skin color. It's not talked about a lot because it is taboo. It may be your sense of proportion (haha) that is incorrect.