In the old days you only found out about how messed up people were, by what came within earshot, or got reported in papers and on the news.
Now every person can prove how messed up they are, by blabbing on forums, for the world to see.
Not surprising so many news articles, even Youtube videos, have disabled comment.
Most of the foul mouthed stuff is from young people. It is the way their parents and teachers have led them to believe it is okay to act, in public.
I eat a meal at a fast food, sit down place. Invariably when some foul mouthed sounds take place, it is young people. (young people used to mean teens and early 20s, but now it means under 40 or 45.)
Either their parents and teachers made no effort to teach them right from wrong, or they are born evil.
And their messed up subculture highly values extreme behavior. The rebel mentality, although all their rebels are merely conforming in a sense.