"Rich" is a subjective term. It depends on who is being asked. If someone asks if I'm rich, I'll answer that I make enough to live comfortable, be able to do what I want, and enjoy my life. My family and I live comfortably and have everything that we need.
Of course, there are people who make more money than me, and some people who live in a much nicer home than I do. However, there are more people who do not make more money than me, who do not have more space to live, who have much less than I do, and who do not have any of the material things that I have.
However, being rich, in my eyes, is relative to how comfortable I feel with my life.