You are in the wrong.
He already stated his position and you keep pushing him. If you want it get it yourself.
I cook porridge in slow cooker and use normal blender. I don't see the need for the food blender that is useful for a few months only.
The rest of his reactions is just the result of unable to handle your unreasonable behavior.
Honestly speaking, if I am your husband. I would just try to explain to you once and state my ground once. He obviously over committed to it and find you irritating and unreasonable. I would too myself.
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First time mother to a pair of QT pie twins