No, it's not because of my age. Young people these days are even more in-your-face, "toxic", nasty etc than the teens I knew growing up. I don't think this really changes based on their politics
Basically young people have less chill today than they did 20 years ago
This extends to every form of media. Kids shows like Amphibia and other Disney channel stuff have faster dialogue and animation sequences than stuff from 20 years ago.
Video games: FPS shooters have become faster. Halo was the standard back in 2003, but the Call of Duty overtook it to become way more popular. CoD is way faster paced and you die in 2 shots instead of Halo's 20 or so.
MOBAs: the entire genre is a symptom of this.
Overwatch: combining MOBAs with FPS is also a symptom of this, the amount of stuff you need to pay attention to is insanely high
Everything 20 years ago, and even 10 years ago, was just way slower and normal.
Be careful using online behavior to gauge general outlook. These voices only seem numerous because the internet collapses geography -- it's a self-selected group of angry people, scattered across the english speaking world, who are posting hateful things because they haven't got anything better to do. They don't represent the median attitude.