Although I get the joke, it's actually the opposite. Most of Hollywood's leading men are actually really short, so if anything finding tall actors is nothing short of a tall order.
15 Actors You Didn’t Know Were Short | ScreenRant
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In Ralph Keyes’s 1980 book titled,
The Height of Your Life, the author concocted a theory about numerous actors — especially the males — are shorter than their fans believe.
“Here’s the deal as I finally figured it out. Entertainment in general is a haven for smaller guys. I think you have to be able to present yourself and be expressive to be an actor, but if you grow up average size or taller, then you don’t grow up with such a need to be forceful or expressive. I think that’s why so many of our actors are smaller guys. It’s no fun being a smaller guy and being given short shrift, so you want people to know that you may be small, but you’re not weak.”
Having had two chihuahuas and an Alaskan Malamute, I can attest to the fact that small dogs are much louder (expressive) than big dogs in order to make up and compensate for their lack of size. It's actually quite funny. The small female especially was a master manipulator. She could charm the pants off anyone.