That is funny, and a stupid offer, but I do get annoyed by the sellers selling something for $50 you offer $45 or something and they counter offer $49. If you aren't going to take a decent offer or at least meet in the middle, why not just turn off the best offer option? Why waste both of our time?
That's an insulting way to haggle though. If $40 is a slightly below fair price and $45 is agreeable to both then that's both a simple and pleasant transaction. Offering to haggle then refusing to haggle by doing that is insulting the same way as severely low balling.