I do not accept humans are static. Much research on human societies shows that behavior and culture are founded in material conditions and environment. These can change, as they have throughout human history.
But you don't want to think about any of the realities.
behavior and culture are founded in material conditions and environment
What is that even supposed to mean? Like yes, people have always existend in an environment centered around material resources. Food being a material resource, for example.
But you don't want to think about any of the realities.
I assume that by "any of the realities" you mean "other perspectives" or "other ideologies" here.
I do want to think about other perspectives and ideologies.
But I also allow myself to criticize them.
I especially allow myself to criticize people who try to prevent others from telling their perspectives, for example by calling them a misanthrope in a demeaning manner.
Marxism is a non-utopian world view. We just don't tolerate misanthropes who think human nature is real, or locked in a static state free from material conditions