from the article I learned there is some bad blood between the Hell's Angels and the Outlaws. sounds like the guy in Austin was a considered a traitor to his colors.
This ties in with another post of HA being shot by a driver in a car with FL plates.
Most of the time the event owners make sure that their event is "neutral" territory.
The net result is some idiot is going to have all motorcycle clothing declared colors.
The mental midgest then declare ANYTHING with a motorcylce term/logo to be colors. Thus a t-shirt with yamaha, harley davidson, or just says "let those who ride decide" are suddently eeevil gang members.