The significance of calling something a slur is that (if you are a reasonable, decent person) you'll try to avoid using slurs because of the ineradicable associations the word has

So when someone says "there was a really trashy lady in here earlier" that doesn't bring certain characteristics to mind? That adjective means nothing to you, and has no associations? You don't picture certain things, certain clothing, mannerisms, or behavior with that at all?