I am 72 years old and I think that people 50 years ago were just as triggered and as politically active as now, but the difference today is we have three 24-hour news channels, smart phones, Facebook, twitter et.al. Those aid massively in polarizing positions and giving the extremes of views more airing. MSNBC and CNN polarize me and I am confident my liberal counterparts are equally polarized by Fox.
For half of my life there were newspapers (they were the record and basically right down the middle of being liberal or conservative) and the only TV news was two, then three channels, and they only had 30 minutes a day of news which with commercials was basically 20 minutes of news a night. We were just as triggered but it was not in our face 24/7.