When I was a kid (I think I was around 11), I went to a Winnipeg Jets/Habs game with a friend of mine in Winnipeg. I bought a Jets pennant and was holding it up high and cheering on the Jets. Three grown men (Montreal fans) a few rows up started threatening me with physical violence and one threw a partially full drink at me.
To this day, I can't understand why 3 adults would do that to a kid who was just having fun at his first ever live NHL game.