I'm trying to get a better grasp of the Witcher universe and I've always wondered about one thing: Apparently a witcher is a very powerful superhuman "mutant" that has access to (low-key) sorcery and an enhanced metabolism, has increased senses and is heavily trained in weaponry and physical combat. So why would any sane man challenge or attack a witcher? I understand that wolfs, drowners or vampires don't really think that way but throughout the game Geralt constantly gets attacked or provoked by "common folk" even though he is wearing his wolf school amulet and his eyes clearly give away his witcher identity.
This throws me off since witcher are known to be lesser empathic beings and also for their superior strength so why would anyone do that (and then obviously get cut in half or beheaded a minute later)? There are several points in the game where people mention that they've heard about Geralt in Dandelions ballads or other legends so it seems that most people know about witchers and their deeds.
An example that completely blew my mind was the quest:
"Reason of State" where in the end Dijkstra (an overweight elderly men wearing a brace because of his broken leg) attacks Geralt.
I don't understand at all why incidents like this occur. Why are there only 2-3 quests where people acknowledge and respect Geralt's witcher powers and retreat? Is it because Geralt is a more powerful witcher than others and witchers in general aren't as powerful as Geralt or Vesemir makes them look? Or is it because in Redania there is such a big hatred and general disrespect for nonhumans?