Sometimes.... you have to call out people and their actions. It reminds me of when my three kid were teenagers- the ME and all about ME moments in life. Once I started treating them as they were treating me, and my efforts, life changed dramatically. They saw and recognized the Golden Rule of do onto me as I do onto you mentality.

It does get tiresome, irritating and even beyond frustrating. Not one person is more important than another.
I am often amazed at how people constantly have their hands out... but when the favor in return is asked upon... nothing.

Tell anon to hang in there... as the old saying goes - This too shall pass. Maybe venting here will open eyes and appreciation will start flowing in his or her direction.