I had a recent run-in on a committee I'm on with Know-All Bloke.
'Are you sure?' he says to me.
Mate, you have spent your life in a field totally unrelated to the one which we are discussing, in which I do have some limited professional background. Also, I have read up on this topic quite thoroughly.
So yeah, I am fucking sure.
I seem to find myself wishing to deck one of his kind about once a decade. The last one was about 75, ten years ago. This one is only about 35.
So yeah, I feel your pain.