1. Get it yourself 2. Just end the relationship so they don't have to endure your abuse

He must be doing it on purpose. Is he secretly filming you and calling it a 'prank'? Either way, just break up with him. Or go to the shop with him and see what he is doing wrong. Did he really go through his whole life without buying toilet paper?

There are lots of things that could be going on, from him trolling you, to him feigning incompetence so that you'll start shopping, to him trying to get you to break up with him, to him having genuine cognitive difficulties, to him being so flustered by your screaming at him that he can't think straight. In exactly zero of these scenarios is it appropriate for you to respond with the abuse you've described yourself giving him. This situation is a massive red flag. Complaining that there's a red flag doesn't fix it. You need an honest talk with him about what is going wrong here. If you two can't have an honest talk, without screaming and threats, then you already have no relationship.

You sound like a real charming person to be in a relationship with.

Amazing trolling of his, and you deserve every bit of it.

this is called weaponized incompetence and it's deliberate. if you get tired of it you'll go do it yourself so he doesn't have to

Of course the first comment is “do it yourself”. That’s the whole purpose of weaponized incompetence. If he’s that dumb it’s probably not right to sleep with him. I just don’t think it’s right to take advantage of mentally handicapped people like that.

Break up with him already.

The best way to not be asked to do chores like shopping or dishes is to totally F it up enough times that they quit asking you to do them.

It’s called weaponozed incompetence, and it’s a form of abuse. Dump this jerk.