Yep the Lightbound and basically any human religious extremists *cough* Scarlet Brotherhood *cough* would definitely target the Void Elves, hell they may even brand the Lightforged as heretics for being so willing to work with them, to be honest, plus it's fun to imagine the Lightbound making a habit of calling any light wielder who object to their methods as heretics, only for Velen, Anduin, or perhaps even a Void Elf to completely shut them down and compare them to the Burning Legion and the Old Gods