Trail Blazers fans are a well spirited bunch, but it's not like football or soccer where tons of beer is consumed and crowds get really rowdy and super-spirited. Your typical cheering and booing will take place, but the atmosphere will be pleasant (That's the same for if you're going to a non-Blazers event as far as I've heard).

Loyal group of people they aren't too crazy, but expect it get pretty loud. There is always those people that come out of nowhere who are die hard fans be ready.