Which language? Which grammar? American Standard? The Queen's English? Shakespeare (in which case I think the singular 'they' is perfectly acceptable)?
Many people, over many years, have been "hit" for "incorrect grammar" on very dubious linguistic grounds. Sixteenth, seventeenth, and eighteenth century English grammarians have a lot of sins to answer for: splitting infinitives (English isn't Latin and never was), for example.
Me, I've discovered I rather like Sumerian, which IIUC has two genders: (a) humans and gods and (b) everything else.
There are plenty of other languages with varying degrees of pronouns. Tagalog, for instance has no distinction between male and female, they're the same pronoun.
Many people, over many years, have been "hit" for "incorrect grammar" on very dubious linguistic grounds. Sixteenth, seventeenth, and eighteenth century English grammarians have a lot of sins to answer for: splitting infinitives (English isn't Latin and never was), for example.
Me, I've discovered I rather like Sumerian, which IIUC has two genders: (a) humans and gods and (b) everything else.
I'll just leave you with Language Log (http://languagelog.ldc.upenn.edu/nll/).