Lowballers
I don't mind any offer that comes from a serious buyer. I do get ticked at the guy that makes a super low offer over the phone without even seeing the car/part. The other part I hate is when a BS'er starts saying "I know where I can get one that is cleaner with new this and that for 1/2 that price". OK, then why in the hell didn't you buy it and why are you here?
The one that tops them all is the guy that looks you car over for an hour, asks 10,000 questions (most of them twice), goes for a test ride, and then beats you down on price. You finally give in and strike a deal and they then start asking about payments or tell you how they should have the money next month! WTF! If you don't have the cash in hand or at least in your account at the bank, don't waste someone else's time!
I'm done ranting now too! LOL