Hardly! Hypocrisy should always be examined. Let's take your example. I am currently typing on a computer, it's true, and indeed it likely contains minerals and parts made by slaves. The computer was sold to me by local wage-slaves. The computer was produced not just by humans, but also by robots[0]. We can thus see that slavery is not ended in the world, and that there are several axes (geographic, economic, (in)human) upon which we can still improve our efforts to understand and end slavery.
We become better people by learning, by examining, and by seeking to eliminate hypocritical beliefs within ourselves.
[0] The word "robot" has a fascinating history of its own. This quote is a good portal to the past: "Sulla isn't a person, Miss Glory, she's a robot."