Em, no you did not misconstrue what you watched, Smith, of the UAF is a disgusting thug of the highest order, he and weyman bennett in particular, routinely stir up racial tension at these demo's. This was one of many reason's Bennett (and other UAF) were arrested for conspiracy to commit serious public order offence's.
I agree with Gromit in that the UAF attract its share of nutter's but if I am honest, the conduct of the UAF at these demo's is far worse than that of the various right-wing groups. (this is also considered the case by most, if not all, front-line police officers and medical staff who police these events).