This is a big problem for me. After all, what's the point in having a beta reader if you ignore their opinions?
It's not a trivial matter; Buffy slagging off Cordy's hair is perfectly feasible even if it did look nice, but Spike's opinion of the hairstyle is actually an important plot point. If he liked the hair it would spin things off in an entirely new direction and necessitate at least one extra chapter. Alas, if I don't have him like it then I'm not going to get any tonight.
So I'm going to have to shelve the writing for a little while.