Agreed, but it's because the following, resulting in the mangling of the language. I'm referring to formal writing style.

Of course, my quote is starting a sentence with a preposition, which is also poor form.

>Because he is no longer accepted as a generic pronoun referring to a person of either sex, it has become common in speech and in informal writing to substitute the third-person plural pronouns they, them, their, and themselves, and the nonstandard singular themself.

https://en.wikipedia.org/wiki/Singular_they