As a grammar and punctuation pedant, I spend some time on fixing the quality of questions (and some answers) on SO. In the vast majority of cases, I am quite sure the OP genuinely doesn't have excellent English, and so silently improving it — in my view — aids English and non-English speakers alike, whilst avoiding direct criticism of the writer.
However today I found a user who I suspect is making persistent writing errors deliberately for stylistic reasons — posts are all in lower case, and all punctuation marks have space prefixes, often resulting in orphaned marks. I politely pointed this out in the comments1 but the lack of reply suggests to me that they intend to persist. A quick click through some of their writing shows that it is a popular error to fix, so thankfully it isn't just my OCD!
In general, if a user — a very helpful one in this case — is deliberately creating edit work, what can be done about it?
1 Sadly, a moderator deleted this conversation, in which the user took offence, refused to justify their mistakes, and chose to ignore others who added their agreement.