Eh, as someone with hyperlexia, it's just a bit frustrating trying to read non-standard English. It sometimes takes me a while to figure out what the user actually meant when using the wrong written form of a homophone.
I think it's partially because I don't really hear speech in my head, so the jump from "it's" to "its", for example, is not obvious to me unless I slowly read it out loud.
I know English is a silly language with even sillier rules, but my brain expects it to be written out a certain way and stops parsing if that doesn't happen.
I've definitely blocked at least one person who had extremely poor English on here before, but not out of spite, simply because they brought me no value beyond just wasting my reading time until my brain eventually goes "I can't read this 🙃" and gets frustrated. IIRC they were writing in very abbreviated English with a ton of typos and homophone mistakes.
If the name ends in an S, you leave a floating apostrophe.
James'
If the name does not end with an S, you place an S after an apostrophe.
Carl's
The only time an S without an apostrophe is valid is when indicating plural. If the noun ends with an S, you do not have to change anything.
Many James
Many Carls