freeloader

In this wonderfully irrational display of a choosing beggar ultimately coming to terms with the fact that people don't enjoy getting bossed around, amidst negotiation. Bring a spicy, unreasonable, and arguably emotionally abusive stance into a talk about buying something; good luck, my dude. Sounds like the jerk in this scenario, ultimately gets what's coming to him, and that is nothing. 

This one was doomed for an irrational meltdown from the onset. Freeloaders have a tendency to emotionally implode when money comes into the mix. No time like the present for that reality check though. Can't put a price on how necessary that is!