The self-styled practical man of affairs who pooh-poohs philosophy as a lot of windy notions is himself a pragmatist or a positivist, and a bad one at that, since he has given no thought to his position.
Before I met Ayn Rand, I was a logical positivist, and accordingly, I didn't believe in absolutes, moral or otherwise. If I couldn't prove a proposition with facts and figures, it was without merit.