To be fair, we're on a geek website. Not many have default settings on any of their devices.
It think the above is consequence of a "I can afford to write all lowercase/do unconventional thing X". And by "afford" I think here more like "I don't have bosses, nor do I have to please anyone doing conventional things".
There was an article or a discussion here a while ago how in a organizational pyramid the people on the botton usually write as normal/nice as possible, while going upwards; people can afford themselves to write however the like, including being super rude if they choose so.