The use of racist, sexist, and homophobic epithets has drastically increased in recent years because we've entered a new, more conservative era, and it's fashionable these days to use such slurs, and to dismiss anybody who objects to them as "PC", a "Lefty", and an oversensitive whiner.
This is a backlash, in response to the socially-liberal 90s, when some people on the Left actually did go a bit too far with political correctness, and caused both conservatives and centrists to feel alienated, oppressed, marginalized, and backward.
Now they are repaying the favor.
These things go in approximately ten-year cycles; the trend of social conservatism and the deliberate and unapologetic offensiveness that goes along with it is already on the wane, having reached its apex in about 2003 or 2004.
The pendulum is swinging Left once again, and moderates and centrists have become as repelled by Right's senseless, arrogant, abrasive bullying as they once were by the Left's intellectual snobbery and whiny insistence that one out of four words in the English language are deeply hurtful and insulting, and ought to be banned.
And that's how it goes.
Ten years from now, they'll be fed up with the wishy-washy, feel-good Left again, and go creeping back to the Right for more oppression and bullying.
But as for right now... I see a lot of indications that society had about enough of it for the time being, and they're ready for another infusion of "political correctness".