I lived in Cambridge and one mate was a Southampton fan and another West Ham so we went to West Ham vs Southampton (in the days of Keegan 1981ish). I'd say it was easily the most scared I've ever been at a football match. Edit; the playoff semi-final at St Andrews comes close.
Yes there are some, in 2016 I had a kidney stone and was in desperate need of a toilet at Wembley Park station after the match and asked a Millwall fan where the bogs were. He told me then congratulated us for a well deserved win.
A few I know said the exact same. Loads congratulating em. Was a bit nervy on wembley way though on the way to the stadium.
The incident at Norwich on Friday probably involved no more than 20 blokes. One seat thrown, not "seats".... typical Sun reporting!!