02/01/2011 3:05 PMPosted by YuujinIn the quote Kael'thas tells both of them that the High Elves have changed their names to the Blood Elves in honor of those who had fallen to the Scourge. She did not seem 'put off' by it at all. Afterwards, Kael'thas and his people continued to serve the Lordaeron Alliance for a while until they are left to die and eventually accept aid from the Naga.
The years of conflict between the night elves and the high elves number so many that they make the Alliance and Horde conflict look like children arguing over a toy. When the high elves lost their immortality, they eventually forgot their brethren as generations lived and died, creating legends of histories. The night elves remembered the damage the highborne brought to the world, and view their descendents as time bombs. When the high elves encountered the night elves, they realized the legends were true and began to resent the fact that the night elves had access to so much power that they refused to use — not to mention the whole matter of exile. Many plot to retake the magically imbued forests for themselves, regardless of the fact that both races belong to the Alliance.
Soruce: Warcraft RPG on High Elf/Night Elf relations. This would only be intensified with Blood Elves, considering their further degeneration into darker magic.