I agree that those would be bad reasons for abandoning "secularism," "anarchism," or "capitalism" as labels.
My reasons for rejecting "capitalism" as a label for individualist, laissez-faire economic views have nothing in particular to do with the fact that critics of libertarianism happen to associate the term with bad things.
My reasons for rejecting "capitalism" as a label for individualist, laissez-faire economic views (at least, on the version libertarian economics that I have an interest in defending) are given in the passage beginning " In conventional debates over capitalism, we are usually offered two major positions — the position of the pro-capitalist Right, and the position of the state socialists…." and runs through to the end of the article. See especially the note on how both the advocates of "capitalism" and also anti-propertarian and state-socialist opponents of "capitalism" tend to obscure the fundamental causal claim that they are both taking for granted. My purpose in talking about the meaning of "capitalism" is to highlight that obscured, presupposed causal claim; and to expose it to some serious questioning and debate.
Of course, maybe you have a complaint about that argument too. But you'd have to actually let me know what it is.
HTH.
My recent post On Being Pretty Much O.K. With That. (Factories, Corporate Secrecy, and Free-Market Anti-Capitalism Edition.)