I hate it.
My brother is the same. On the weekend my dad had a carport completed at his home. Brother is doing the IBR sinks with posy drives. He does 2 sheets before I arrive to see how things are going. I tell him one sheet is not lined properly. (He stays with my folks, I don't) So I show him that the angel on the wall is not flush and the sheets need to be gapped at the back on the lip channel so it doesn't show at the front.
He REFUSES to understand it no matter how many time I try and explain it to him or draw it.
I get frustrated and get on the frame myself and attach the other 8 sheets...
I won back as much of the gap as I could. Still ended up with a small gap in the last corner because of his cock-up. But Dad said I should leave the 2 sheets when I wanted to correct it. (Holes already drilled and will leak). So when ALL is done he says: "Ok I see what you meant" All the while drinking beer and talking crap while I sweat on the roof drilling in Posy drives... ARGH!!!!