We all make mistakes, there's no doubt about it, but a mistake in grammar? Especially in writing? Yikes. Which one makes you mental?
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Drives me nuts when people use the words their, there, and they're incorrectly.
Their = belonging to.
"Karen demanded their drinks come first."
There = location.
"Look at that Karen over there demanding drinks."
They're = they are.
"They're going to get kicked out if they keep demanding drinks."