Gurubashi summoning Hakkar twice and trying to enslave him once. Drakkari killing their gods to preserve their race. Zandalari failing all over the world, because some dude said they have to, because voodoo dreams and shiet. Zul'farrak getting wrecked because their chieftain is obsessed with Sul'thraze and destiny and shiet. The ancient Zandalari getting attacked by the Aqir, because good o'l Zan'do and his followers thought the corpse of Kith'ix was a Loa. Zalazane being driven mad by the voodoo powers, that Gadrin taught him and then using that power to slaughter his own people.
Their is probably more...
Okay, you convinced me, I'm sorry.
And since Ramz got his mind already set, I don't even bother to talk with him. Some people just blindly love them and write their own fanfics on how the race is functioning. You could link them some stuff like in-game books or recommend book like Chronicles but I doubt it would change their opinion on it.
Good arguments you not have. Still much to learn you have.
They are really smart and cool and you are stupid if you think otherwise!