i think pappycat's absolutely right....to not jump to the worst assumptions (unless of course those assumptions are thrown in your face). and yeah, people may just not have a way that they feel is adequate to the crafty thing you did. i guess it deserves a calm question if your feelings are on the line, but to stand your ground if you already know the answer.
for the girl who wants a designer dress, i don't really see it any different if it were handmade or bought. would you (or should you) feel bad if someone asks you to get them a $1,000 present for their birthday and you can't afford that? of course not. so if her request is something you can't/don't want to fulfill, just explain, well i know you asked for that, but this is what i could do with my time/resources/patience for your rude a$$ that i had available