I doubt that "your" and "you're" are homophones in most other languages. As a native English speaker myself, I often slip up and write "your" when I mean "you're" because they both sound the same in my head and it's quicker to type "your".
I think that a non-native speaker would be less like to make this mistake, because it requires the writer to decide to contract the pronoun and the verb and then forget to use an apostrophe.
I think this is far more likely to happen if you're simply typing out a stream of consciousness than if you're translating your thoughts from a different language.
Another reason non-natives don't do this mistake might be that usually they are thought the written language first, so schools concentrate on grammatical issues more.
As the parent commenter said, I've also noticed in the past that this mix up occurs usually among native English speakers. I've noticed it with other languages too, that native speakers often mix up homophones, probably because as a native speaker you write as you would speak and either you don't care or don't even think about it.
It may seem obvious, but I never before considered how the simple grammatical mistakes I frequently make disproportionately hinder the ability of non-native speakers to efficiently comprehend my posts.
Your comment has given me an extra incentive to carefully proofread my future HN comments before posting.
I agree with the other comment that this thread is toxic. I didn't intend that. I guess I learned a lesson.