"I am so important that I do not need to proofread anything I write"

"Everyone (including my own family) is not that smart"

It is hard to not get upset with people that go through life with that mindset.

Treat others the way you want to be treated is the way things work over here.

Neither of your quoted statements are things the OP implied.

He may not value proofreading but you are poor at reading comprehension.