Whoa... so in reading the latest entries, let me get this straight. He already knew of your plans to buy the truck? And he also knew the money was coming in from disability? Yet what he was not informed of was when the money came into your account? And that is it? And then you bought a truck because you are taking care of your father and needed the truck?
This puts a whole different spin on this situation..... if he already was aware of your intent to purchase the truck, AND of the money coming in, then yes, this does seem like an overreaction on his part.
I still remain of the same opinion that his nastiness towards you was completely uncalled for.