UK Martin I have been going to speedway for years at various different tracks as a speedway fan rather than a follower of a particular team. I can assure you these "fans" were cheering when the riders fell, and making hand gestures when they (thankfully) got up!
I like atmosphere and friendly banter as much as the next person and remember the days when that's what it was!
This was pure vitriole and something I don't want, or expect to witness again! Adam Kirby was subjected to actual personal abuse! And this can never be acceptable!!