I can accept people mixing up Their and There (Though it does irk me slightly)
But when you mix up Your with You're/Their+There with They're, then I just have a mind explosion.
They're and You're are contractions, you should never mix them up with the other word!
It's literally the only grammatical mistake that makes me internally suffer.
I can handle things like "Supper Smash Bros Mishonh From God"
But You're and They're...
...

"BEEEEEP BEEEEEEEEP"
"BEEEEEEEP BEEEEP"
*Sits down and
sighs BEEPS*
YOU CANNOT GRASP THE TRUE FORM OF BRAYZ'S GRAMMAR.