Each generation is ruder than the last, at least for the last several decades, just research old media, discussions, media excerpts, accepted social norms etc going back to the 1920s.
Even many of the public enemy bad guys in the 1930s were known for being polite, and they were infamous because what they were doing was uncommon.
The 1960s generation was brash and had much more crude and vulgar social norms than the 40s or 50s. The 70s, 80s, and 90s each were a little worse than the prior decade. Kids in the 2000s were even bigger brats on average, and there is little reason to think the trend won't continue.
As the next generation takes part more in firearms it is bound to get a little ruder overall, because the new 20 somethings are ruder than the 30 somethings, who were ruder than most of the 40 somethings. Part of it is maturity, but part is also the generation and social norms they grew up in.
Firearms also became a lot more mainstream around the Obama election. Large numbers of people that never even owned a gun were going out purchasing one, it was probably one of the biggest surges in gun ownership in many years.
You could tell many of them, they were often the people rushing out to buy handguns, while most panicking prior owners were trying to stock up on certain types of rifles those with experience knew were more likely to be targeted.
Well more mainstream comes with a larger number of people, and the population in general is a bit ruder than some of the old sportsmen and collectors.
That brings up another aspect, a big part of firearm popularity used to be in sports (too much in fact just look at the "sporting" clauses we got as a result when the 2nd had absolutely nothing to do with sports) and hunting.
Hobbyists into such activities were in general a more polite group than the general population, but now the general population has more gun owners, especially of the non-sportsman types, at least since the time the internet and forums have been available to the general public.
This means the average gun owner is in fact ruder, because there is a lot more gun owners in the general population than in the 90s and early 2000s.
So it is really a victory, as gun ownership has become more widespread and more mainstream, and embraced more by a larger number of the latest of age generation the prior polite minority of the population are more engulfed in the wave of the general population. A general population that is on average much ruder.
So it is actually good news, gun ownership and use is becoming much more widespread and mainstream so fighting for and maintaining rights is easier.