Masculine pronouns sound much better. I always try to use them instead of singular "they".

Might I ask how you qualify "better" (sounding) in this case?

Some people feel that exclusively using "he him his" effectively erases half the population when such language is used in discussing a topic.

The free speech we all enjoy stops being fair, equal, and "just an opinion" when it is suddenly reinforced and backed up by influence, the ability to suggest policy, to set an example for behabior and tone, etc.

As an admin moderator, I would have expected you to take more care with a more friendly neutral choice of words.
"sounds better in your opinion" doesn't make it right.

The Cambridge Guide to English Usage is an A–Z reference book, giving an up-to-date account of the debatable issues of English usage and written style.

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When we need to refer back to something in the third person plural, the pronoun they them their serves the purpose. It also serves generic purposes, in statements which claim universal validity:

They also serve who only stand and wait.

"Universal" use of the third person plural pronoun is also the one found in statements like:

Everyone has to consider their future.

This of course is more contentious. Purists might say that it's ungrammatical to use their after everyone, because one requires a singular pronoun. Many others would say that generic universal their provides us with a gender-free pronoun, avoiding the exclusive his and the clumsy his her. It avoids gratuitous sexism and gives the statement broadest reference.

With determiners such as each, the same things apply:

Each member of the group must be prepared to bring in samples of their work to discuss.

Again the use of their following an indefinite noun phrase allows it to remain gender-free and inclusive.

They them their are now freely used in agreement with singular indefinite pronouns and determiners, those with universal implications such as any(one), every(one), no(one), as well as each and some(one), whose reference is often more individual. For those listening or reading, it has become unremarkable - an element of common usage. In fact the Oxford Dictionary (1989) has it on record since C16, but its acceptance was preempted by C18 grammarians, whose anxieties about formal agreement were reiterated in C20 by Fowler (1926) and Gowers (1965). The singular use of they them their after everyone and other indefinites can now be explained as a kind of "notional agreement" (see underagreement).

Current dictionaries register the singular use of they, them and their among its definitions, often with an explanatory usage note. New Oxford (1998) treats their acceptability after indefinite pronouns as given, and is willing to embrace the next stage (use with indefinite nouns) in dictionary definitions. Merriam-Webster (2000) takes both for granted. The Canadian Oxford (1998) plays down the objections against its spreading use, and underscores its usefulness in avoiding sexist language. Webster's English Usage (1989) illustrates current uses of singular they them their following indefinite nouns and pronouns in various kinds of publication from the mass-circulating to the academic. Australian research by Eagleson (1995) finds singular use of they them their in a range of writing from advertising to professional publications and legislation. The Australian government Style Manual (2002) endorses it as "standard idiom in most contexts." All this evidence from different quarters of the English-speaking world shows that singular use of they them their after indefinites is now well established in writing.

Language historians would note that the trend towards using they for both plural and singular is exactly what happened with you some centuries ago (see you and ye). The trend is probably "irreversible" (Burchfield, 1996). Those who find it uncomfortable can take advantage of the various avoidance strategies mentioned under he and/or she, to be used when grammatical liberties with they them their are unthinkable. Yet that kind of response to singular they them their is no longer shared by the English-speaking population at large. Writers who use singular they them their are not at fault.

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It is 2012 for heaven's sake. Would "singular they theirs them" be too much to ask for?

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Masculine pronouns sound much better. I always try to use them instead of singular "they".

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Yes it would! Singular "they, theirs" sounds asinine. People with cerebral constipation introduced it and the pinheads adopted it.

And now here is my quoting something written by shakespeare ... truly asinine indeed. I mostly just have trouble understanding why people prefer it in the its original grammatical "ye old" style: