It can sometimes be a good thing like my passed Life drawing class for instance =). It depends on how you see it, whether you realize the person wants to push you to see if you'd give up easily,(like my professor) because it makes you try hard (well that's what it did to me)
If the person who you're dealing with has that attitude and is just out to get you, RUN!!
(good heavens do I ever edit posts...sheesh!)