If you act alpha as a non chad, people will dislike you for it, because ugly men are not supposed to have confidence or be assertive, in normies minds that is reserved for chad only.
You mention dictators, the ruler of North Korea is a ricecel and acts "alpha" and everyone hates him, think about it? Do you think it would be the same if he was a 6'3 aryan chad? Normies think he is a horrible man, starves his people etc. But if he was chad you would find many more normies (Especially females) justifying his behaviour and making excuses for him.
Every single thing in this world comes down to looks.