Agreed with Sharky. PC terms seem to be invented to prevent offending a small minority of people who are easily offended, and very vocal about how offended they are. I'm a woman, and frankly I couldn't care less if you use the word "salesman" to refer to a dude who sells you things. He/she is unwieldy as a term, "they" is frowned upon as grammatically incorrect, and "it" is frowned upon in general for being "inhuman." It's too bad we don't have a 3rd person singular that works! (Then again, we don't have a 2nd person informal plural either, so I tend to use "yall" even if it is a hillbilly term!) I tend to lump political correctness into the same category as censorship, and think it's all kinda silly.
I've always thought of the real reason for words is to communicate ideas. As long as the right idea gets across and is expressed, then the actual wording matters little. I'll never be a grammarian, and PC? Only when I might be quoted publicly or on formal papers. Otherwise? Bah, screw it. As long as we understand each other, why quibble about details?