No offense, but this chick is a heartless *****.
How could you think you screwed up by buying her something considering her personal tastes (which is wayyyyy more thoughtful than boring old flowers...)?? Who in hell drops a gift on the floor, even if they don't like it?? A person with any decency would at least thank you and be happy that you thought of them at all. So....to answer your question.....it is SHE who (is) screwed up.
Did your callous 'friend' think to get anything for you, might I ask?