I would just simply stop doing so much for him. He will hopefully then see what it is you do for him in the background because he will miss it. For example, next time he complains about hard toast, if I were in your shoes, I would calmly take it out of his hand and put it in the dustbin. If your toast isn't good enough, let him make his own.

He sounds very self-centered, even if he doesn't mean to be (I do not know him to know if it's not something he is aware of). I understand that your kindness and patience has helped him get better in some things, but being a little tougher (without confrontation, blame or whatever) can also help. It can also be a quicker way to get things to the front and hopefully improve, rather than this long, drawn out way that is clearly getting on your goat.

By the way, I agree with Hamster, you write well.

Hugs.