it happens. learning from it is all you can do. i mean, i saw a newscaster use the word 'gypped' and not know that it was also a derogatory term. i used 'coon's age' up until i was 18 and got told by a friend what it meant. some are a little more dependent upon location than others. bonus for you is that you aren't being a defensive jackass about it and 'no no' like i've seen someone else do who used it on one of the anon comms.