User blog comment:ForestFairy/How to Take the Fun Out of Trolling/@comment-24756040-20150606233859/@comment-8117023-20150607061108

Not necessarily. Using 'them' as a singular pronoun in a sentence does not automatically mean that the rest of the sentence has to be pluralised.

However, if you use 'they', you will have to adapt some sentences (e.g 'they are', rather than 'they is').