Comment by turnsout

Yes. There are true facts, but the concept of "rationality" presupposes that there is one correct way to interpret these facts and translate them into behavior.

Two people observe someone beating another person. One person moves forward to intervene and stop the violence. The other moves away to protect themselves. Which person has acted rationally? They may have both acted in complete alignment with their personal philosophies, and they may each view the other as irrational.

"Rationality" is completely subjective to your own values and belief systems. Human behavior is infinitely more complex than formal logic allows.