Well, there are mathematicians... and musicians... and spellers. The your/you're, their/they're/there, it's/its and especially "definately" misuse and misspelling get to me like a sliver under a fingernail: yes, it's a small wound, but it hurts ever so much anyway.

But, this is the Internet, folks. No one has to pass any sort of examination to log on. And they are doing their bit to tell the world that where they come from, proper spelling and grammar doesn't really matter.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks