Played baseball, football, track, and hockey growing up. Played hockey into college and a bunch of guys I grew up playing with played various levels of college and pro including the NHL. The parents that were the worst and seem to be to this day are the ones that either never played or were shit. That seemed mostly true when I grew up (graduated H.S. 2004). There were always shit parents but it seems like going after officials is way worse as I never witnessed it even in some pretty heated games. Seemed like if a fan was getting out of hand other parents would shut it down.
However, haven't heard of as many fist fights in the stands like used to happen in the 70s when my dad and uncles played. Mostly I think it is noticed more like anything because ease of recording it and how fast news travels.