No, apparently you can't police your own language. But your act of "correcting" strawman to "strawperson" IS an act of "language policing" -- you're policing the language of the person who used "strawman".
And it was you yourself who said that language policing proves one wrong.
Sure, you do indeed have the right to prove yourself wrong.
Only, it's changing the age-old term strawmen to "strawpeople" that is the language policing here.