At 49, I see the exact opposite. Members of my generation tended to exhibit more tact and decorum. The urge to dress like a hobo, swear all the time, and flame everyone in sight is a classic overcompensation for years of helicopter parenting which forbade all of these things.
"In some cases, it's honesty."
In others, it's honesty used as a pretext for acting out.
Note I also make this observation.
Also note that I am specifically pointing out reactions to criticism. The other changes in decorum have been noted by previous generations since at least the 1800s. Waltzing was once a lascivious corrosive to society's morals.
Also: we are likely less than 4 years apart in age. I could do with more decorum, as I've been learning over the past 4 years.