His place in this line tells a tale, a tale of what happens when we’re taken for granted, a tale of him prioritizing his ego over our own, and a tale of him not being able to find anything to compliment us on. The most appalling part about this is that whenever we compliment him, the most he can muster is a thanks, and it's not even an appreciative one.
To be fair, there are some really valid reasons as to why he doesn’t complement us. There are, in real life, people who simply don’t have the capacity to compliment. Our best suggestion is to ask him why he doesn’t compliment us before jumping to conclusions, because doing so will, or at least should, let him know that we’d appreciate one every so often. Actually, scratch that, because we don’t want to give him any room to wiggle, and will need to explicitly state our needs, because if he’s interested he’ll make an effort to do so.