Hes smarter because I have no idea what he said. O.o
Well, let's start by establishing that infrared has a much shorter wavelength than that of ultraviolet.
Now, because of the fact that if you or the object in question (being observed) is moving, the wavelengths of sound or, in this case, light compress or expand, based on whether or not the object is moving towards you or away from you. (This is more noticeable with sound because it moves slower.)
If the wavelength compresses, then it is getting shorter. Therefore it is
redshift. If the wavelength expands, then it is getting longer. Therefore it is
blueshift.
Now, you might think, "But what if I'm between the black hole and the object? It would get closer." WRONG. You would be closer to the black hole and would therefore be going faster (given that both objects have the same mass. If they're of different masses then there is some small potential for redshift.) Of course, by the time that situation arouse, you wouldn't care anyway due to the gravitational effects of the black hole being lethal to you.