Common Usage

Do you wonder when it's common usage mistakes or just someone being picky? I'm a writer and I have above average grammar skills. I know a few grammarians who still correct a few things about my usage (like ending sentences with prepositions) that may be part of common speech patterns, especially in my geographical area, but overall I can construct decent sentences and I use the proper word.

Some words are more difficult to use properly than others. Is it picky to make certain you use the...