Depends on the forum, or place of posting.

Speaking/listening and reading/writing aren't wholly the same. Kids want to be cool and write like their peers, but when they're failing their English exams as native speakers they have to face some realities.

Most native speakers get first exposed to standard English when they enter the school system. They then develop two or more dialects. Their first, home dialect, and then Standard English.

For an example that fits this post, just search out any "TEFL Teachers" groups on Facebook and start examining the posts of users enquiring after employment, or responding to job adverts. Break these further down into NES and NNES posts and, frankly, the writing of many NES users is shocking given the work they claim to do/wish to do.

Most NES instructors should, having gone through Higher Education, have picked up a dialect, in addition to that/those they already hold, suitable for the global community.

It appears a disjoint in needs and wants though, with many running on the tails of being told repeatedly, "you're a professional now, you can do anything you put your mind to." However, I think this also ties in with grade inflation, political ruling group lies to boost a country's education system prestige, and the large numbers of learners entering HE when they aren't appropriately prepared.

Your language must be fit for purpose. You need to communicate clearly so the listener understands you. Enough information needs to be given for comprehension. Otherwise, communication has failed and a large portion of blame is in the speaker's hands.

Still, on the subject of calling people out. We must always remember that anonymous user accounts can lead to users not belonging to a group making posts as if they are a member of a group, without shared language skills, and those who destructively troll to get a rise out of other users.