I agree to a certain extent, but our perspectives have changed over the years, too. Let's not pretend there weren't complete jerks at those games. I remember scanning the crowd for fights in the early 90s.
That being said, yes, it is undoubtedly worse now. The complete jerks have multiplied many times over. Instead of an excuse to have fun, it's become, in large part, an excuse to get fuggin' polluted, brah.