Snatched from Failbook:

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Someone not only does not understand the there/their/they’re distinction, in fact xe (I want to say the first speaker is female because xe’s complimenting someone’s boots, but really I have no idea) is willfully ignorant of how contractions work. First we have the first speaker, depicted with white outlined in black, whom I will call MW for Multiple Wrong. Then we have the second speaker, shown in white outlined in pink, whom I will call PW for Partial Wrong.
MW not only is determined that THEIR means THEY ARE and I suppose THEY’RE never occurs to this person, but xe also uses “y’all” inappropriately. The phrase “yall all” is nonsense. I am Southern enough to know that “y’all” (note the apostrophe) is a contraction of “you all,” and therefore the second “all” is meaningless.
PW correctly points out (though MW is too ignorant to understand the correction) that THEY’RE should take the place of THEIR, but xe also misuses ITS in the place of IT’S. We need a verb phrase here, not a possessive, which means that IT’S takes an apostrophe. That was something they both got wrong.

