I'm not asking from a judgmental standpoint before I get flamed but rather a very genuine 'I just don't get it' kind of way... 
I went to a bog standard inner city primary school and before I left, so age 11, knew the difference between words such as you're, your, there, their, and they're (alongside aisle as opposed to isle as another example); yet all of those being used incorrectly seems to be increasingly commonplace. And that confuses me as I know my primary education was nothing special and very def. know I do not know all I'd like to yet I'm (maybe incorrectly?) assuming that all others born into same system would have had the same basic education and thus would know the difference* between their own their/they're/there??? And no, I very definitely did not have any fucking kind of support 'additional parental support' so I don't think that can be the variable either.
So has basic Primary education got worse, or is it I'm just getting old or something and thus noticing it more? Genuinely curious as to other's equally anecdotal observations or their professional experience of this.
[*I'm obviously not referring to anyone for whom English is a second language, nor anyone like DS3 who has SEN]