And don't forget the unforgettable there.
Kids who grow up in the English speaking world learn much of their English at home, from their parents or guardians. So by the time they've hit the first grade, they've already learned bad English if their adults are not well educated.
And even when they do get to school, it's but for a few hours each day and even less studying English. So when they go home after school they get even more bad English from their parents et al. So yes they speak it every day, but with their peers and adults who are poorly educated. And to a point, speaking English does not differentiate between they're, their, and there as they are homonyms.