And my point is that I went out of my way not to use it any more in that circumstance.
Yet in the years since, I still talk about poor decisionmaking, poor luck, poor performance, and poor word choice. Because it would be poor logic to go through life auditing everything I say just in case a middle schooler with a somewhat poor vocabulary might mistake my meaning.
Which brings me right back to "there is a very obvious difference between the offensiveness of 'poor' and 'retard', you obviously know that."
"Poor" has non-offensive uses so you can continue to use it in other ways. You don't need to advocate for the non-offensive uses of a slur. You know regardless of the context, some people will be offended by its use.