A Narsicist [or a narcissistic person]..... or just extremely self-centered.. basically the same thing. They have no sense of anyone elses feelings, etc..... just totally absorbed in themselves. If the person doesn't seem particularly malicious or arrogant, they might not even be aware that they are behaving that way... maybe....
A user ? Ungrateful ? Maybe they think they're entitled? Maybe they're oblivious to the fact that what they're doing is not right ?
People I do not associate with!