I would say it is far far worse.
Almost anything we think and do is pretty irrational.
The only rationale for most of human activities is that we are specifically humans.

All of culture is specific to humans.
We still need to eat and reproduce and stuff. But when that is done we start making stuff up.
What is rational about having fun while watching two groups of men run after a ball?
What is rational about going to the moon?
What is rational about over farming your land?
The answer to most of such questions is "It is not rational, it is just how our brain happens to work".

We humans are full of biases and prejudice and other irrational stuff. It has shaped our societies in almost every way.