I hate to be that guy, but apparently I don’t hate it enough to stop myself from saying:
Their, there and they’re are three completely different words, and using them incorrectly is like putting speed bumps on the freeway. Every time I hit one, I metaphorically have to stop and make sure my oil pan is still there, while literally backing up and mentally correcting the improper usage so that the sentence actually makes sense.
It’s personally my least favorite common misuse. Worse than its vs it’s (which yes, I recognize that I violate all the time, and I try not to correct people when I see the improper use of it’s or its)