D&D General Classes getting along or not

[Greenstone.Walker]

Classes are not personalities.

Also, nothing says all wizards have to be the same or all warlocks have to be the same.

You could say something like "Fighters trained by the Warrior Society of Someplace City all hate warlocks, because the Warrior Society indoctrinate all their students to think that."

But not, "Fighters hate warlocks."