You’re not crazy. Nobody wants their grammar correcting; they lash out and call people who do that “grammar nazis” instead of thanking them for helping them improve. So they get to post whatever they like, and of course as more people see stuff spelt incorrectly they assume that’s correct and use those errors themselves, but intentionally. And of course the dictionary writers realise they are descriptive, not proscriptive, so the argument “the dictionary says…” is voided.

Autocorrect is OK to an extent but it’s not smart enough yet to understand what people are actually saying. So it gets switched off.

Also it is worth mentioning that English is a complex language with many inconsistencies. “extream” is incorrect, but “stream” isn’t, and that “eam/eme” is pronounced the same way. So “extream” is at least understandable. It’s similar to “ect” instead of “etc”, which is commonly mispronounced as “ek-setera” so you can see why people think the C is after the E.

I used to try to help people a lot but just got a whole load of abuse back. These days I only query something if I genuinely can’t grok what they’re trying to say. Or I just ignore it. If the question is so badly garbled that I can’t understand it I just assume they won’t be able to understand may answer, which will probably be quite detailed.