The rare times mods use
(USER WAS BANNED FOR THIS POST)
They usually do it for the lulz or because the reason of the ban is becoming a trend.
An even when they ban with the red text, sometimes they autosage the tread.
Another fact is that when you are (USER WAS BANNED FOR THIS POST) you can still browse 4chan but you can´t post.
I have once been banned with the red text.
Most bans go out silently.