Almost beat up a inconsiderate asshole today

I’m trying to sell my truck and this guy on marketplace comes to take a look at it, spent 30 minutes showing him the truck and test driving it. He offers $1200 (asking price was $3000) and I think he’s joking, but I see he’s serious and I tell him that’s way too low. This guy tells me that’s all the money he has on him….i was livid. I told him to get the hell off my property. Then he tries to act like I did him wrong and started raising his voice at me, I told him he was a bum and that he just wasted my time. He tried getting up in my face but he ended up walking back to his car and he left.