users who say that you haven't taken anything from anyone when they copy bits, and then someone come along and copy bits they care about and the tune change.
And many don't, which you've acknowledged. So, how is this different from any number of other hypocrisies that human beings regularly commit in all areas of life? What you're describing has had entire books written on it that have nothing to do with tech or IP rights or law. What you're saying, essentially, is that Slashdot commentators are a fairly typical swath of human beings.
This is still a bad example, as it is an issue of credit for work done, not copying, as the person who did the work doesn't own it nor claim to have any right to it. It is a simple case of wanting credit for the work he or she did.