Their vs. there vs. they're

English is not my first language but I did my best to become as fluent as possible. And I find it strange and mildly annoying when so many native speakers are so careless with their spelling.
Their = belonging to them
There = answers the question "where?"
They're = they are.

And no, I'm not a grammar Nazi, but this is very basic!

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SW-User

It's not a given that just because someone is a native speaker of a language, especially English, they're better at it. A lot of spoken English is not even grammatically correct, a lot of it is bastardised into slang and other forms that is supposed to sound cool and hip.
A lot of non native speakers who put in the time and effort tend to be better at the grammar because they learn it properly.