[Morthoron]

Thingol suffers from the same overweaning pride that affected many 1st Age Elves (take your pick, Feanor, Celegorm, Caranthir, Turgon, Eol, et al.). These were not sweet Legolas Mary-Sue Elves, but Eldar or First Born who had been slicing up Orcs (and sometimes other Elves) for a few centuries. They were haughty because they were indeed superior and they knew it

Take Thingol, for instance. He is born in Cuivienen before the sun or moon are even in orbit, he is chosen to be spokesman of his clan, he travels to Valinor, returns to become king of the Sindar in the great realm of Doriath, marries Melian the Maia, and his child is the most beautiful creature in all creation. Think about it, how do you even dare speak to someone like that if you are a mere mortal? I am not saying ol' Thingol didn't need a major attitude adjustment, but you have to take his actions into context.