This still doesn't excuse his demanding and selfish behavior.
And what if the solution was something more than this?
It's good to provide answers along with the questions in the internet. People can search by questions, because if they already knew the answer they wouldn't need to search for it.
I agree that it is something easy, and thank you for providing a possible solution, but this is not the whole problem. You can't just demand help and give nothing in return. If someone helped you irl, you'd at least buy them a beer, right? You wouldn't just say "Ok, you can go now." and walk away, would you?