In these debates, some defendants might say something like This way of speaking is not wrong, it is evolving language, as an appeal to the other side to admit the relativity of normative categories in language.
Advocates of a prescriptive approach to language tend to obfuscate that fact, by declaring that certain ways to utter something (which they criticize) were "plainly wrong" -- ignoring the relativity, the social context-dependency of what it means to be wrong in languages. In these debates, some defendants might say something like This way of speaking is not wrong, it is evolving language, as an appeal to the other side to admit the relativity of normative categories in language.