What does being American have to do with anything?
Provide a source to support what is clearly a biased opinion.
What you’re describing, objectification, is a downstream effect, not a cause. A person would already have to hold anti-trans views to behave the way you’re describing. The bias exists prior to the porn consumption, or that bias may even influence the type of content they seek out.
Roughly 7 out of 10 people in America watch porn at least occasionally. That represents a majority of the population. More than half the country is not anti-trans, which directly undermines your claim about “the perception of trans people.”