overthinkinglotr posted this in-depth look at how they used cinematography to emphasize the hobbits height in The Lord of the Rings films. They really did an amazing job at this even though you don’t consciously notice it. Here are some great examples:
Source: overthinkinglotr
Its important to realize that the same happens IRL, because humans have pretty significant sexual dimorphism, with men being quite larger, not to mention, stronger.
It is quite easy for a man to be accidentally intimidating to a woman (let alone a child) just by being that much taller and bigger in general.