There are complaints that it's hard to remember what you can say and what you can't, which words are 'in' for certain groups and which words are not. And yet we started out learning that the 'kitty' on the sidewalk was actually a squirrel, we learned to differentiate between fire trucks and school buses, and many people today know the difference between linguini, fettucini, and rotini. The same people who say they can't remember the 'right' terms in referring to people are often whizzes at remembering which professional sports teams have moved where and are now called what.