This morning I am annoyed

I went to my mum's outdoor 60th birthday party and she had invited her wheelchair bound friend to the party. It was in the back garden with a very narrow pathway to the party and they (my mum's friend and her mum, also my mum's friend) wanted to get past this awkward part that was too narrow because of the concrete stairs to the house.

So my brother and I stick around to help. He suggests he lift the very heavy wheelchair in which the person in the wheelchair and her mum both say that it's too heavy and they'd rather not try. To which my brother starts inspecting the wheelchair and goes to touch it multiple times, at which point I said, each time, "you can't touch it, you need to ask first" (he did actually touch it once, I think)

Which like should be common knowledge, I thought was common knowledge. Like, in the vein of, you wouldn't touch someone's purse without asking why would you touch their wheelchair (obviously this is an imperfect example because wheelchairs are not just like purses etc).

After they were past this tricky point, my brother, gives me this absolutely furious-with-me look and storms off to calm down. I hate it. But I feel incredibly strongly about consent, and it is actually an important thing... :(