It's true that it is often the older crowd that get involved. When I started going to games in the 70s, it was the running joke was that the old blokes in the main stand with their flasks of soup and travelling rugs on their knees that complained the most. There was more than a grain of truth to that.
There was plenty of abuse from the terraces too, but that was usually aimed at players.
I don't think the younger generation are exempt though, they just vent their anger in a different way - typically social media.
Of course, for all of the above it's only "some fans". The fans you never hear about, which are the majority, are the ones that never post on here, are rarely on social media, and have recovered from any poor performances by they time they have watched the latest episode of Doctor Who and had their tea.