There is too much store in winning, as opposed from taking part, or competing. All sport is obviously about winning and it feels good when you or your team win....but at what cost? The intense rivalry in some of the fixtures is long established and at those games the emotions get ramped up, for all of us. Yet, certainly from the early seventies on, there has been a small percentage of fans(of most big clubs) who can and do go too far. Winning is everything now, and it's often not enough to celebrate your success, there is now a need to belittle or rub your competitors lack of success in the dirt, fine if just banter, but poisonous and potentially terrifying when amplified by a large crowd. Going to the match is putting yourself, your mates, your children into a fairly hostile environment, there will be swearing and sometimes feral nastiness. How much of that you are prepared to tolerate is your personal choice.
Is the match day experience worse? I don't know, I'm not interested in going anymore(many reasons)...but some fixtures will be fairly mild, and some will be quite toxic and intimidating, as was always the way.
As tezmac said: The terraces are a reflection of society. As for the game itself, it evolves...but that's a whole other story.