When I cook, my brother constantly tells me what to do (i.e. what vegetables to add, how small should I cut, what ingredient to add, what to cook besides the main dish, etc.). Sometimes I agree with him and I add the comply, but sometimes I just don't want to do that because I'm too tired and just get things done to eat, or just plainly because I don't want to do it that way

He always keep saying that whether he says I say no, and just invites himself to do that for the cooking. Sometimes I'm fine because he is doing me a favor, but other times he starts chopping stuff because "I'm too slow". When I tell him to have some patience he gets mad and sometimes things escalate.

Sometimes I'm chopping something, mixing some sauce or frying some meat when he gets next to me and tell me what to do. I do my best but he keep telling me I'm not hearing him and he just take the spoon, spatule, knife from my hand, or invading my personal space when I'm doing something.

Something I specially have told him to stop doing was to pick things from my hand while I'm cooking because it pisses me off. He tells me that it pisses him off that I don't hear him and want to do things my own way instead of right one (i.e. sometimes I have trouble avoiding getting the onions burned while I'm cooking them, and he gets pissed off.). I tell him I don't care and I'm done explaining that it bothers me and even if he thinks it's the right thing, he shouldn't do that because it makes me feel sad, mad, and angry.

I have told him to stop doing that because it feel like he's not helping but rather he wants thing to go his way and I'm the one helping, not cooking. I want to do things on my own. When he keeps doing that, I get on my nerve and tell him to stop, and then things escalate about other chores.

Am I the asshole for this? How can I stop this to stop? I care a lot about my brother and I don't want our relationship to get worse because of seemingly meaningless stuff like this. We are very close and I don't want to grown spiteful of one another.