What do you call an invalidation of someone's argument because they cannot differentiate between their and they're?

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Argument Jokes More Argument Jokes

Why can't a vegetable win an argument?

Cuz he always uses a straw, man!

Why do vampires hate arguments?

Because they make themselves cross.

Differentiate Jokes More Differentiate Jokes

Why do differentiating mathematicians prefer Manhattans to Mojitos?

Ryes over rum.

Why do they say "character actress"?

Is that to differentiate them from all those actresses that only play walls and bits of furniture?