Especially with so many competing standards. Personally, I use the singular 'they.' I mean, yes, it's not technically correct, but people understand you.

And, after all, 'em eir ey' aren't technically correct either. On account of not being words.

I have mellowed in the last year or so. I no longer downvote every comment that uses that kind of language. They no longer have the same close ties with an abhorrent (local) political agenda so I can now consider them more or less acceptable.

EDIT: Most unexpected significant and rapid downvoting of one of my comments ever. I retract it, including the downvote policy change - I have returned to considering the subject as distasteful politics.