Its just a wild gess but i don't think he's to keen on motorcyclists. !
I think he may also be prone to a bit of exageration.
I was out that way last week and I did not really come across very many other bikes, saw loads in the Abbergavveny "bike park" and a load more in the Garage at Crossgates but very few actually on the road, certainly not "gangs racing", although there is a tiny minority that are like that it is probably way below 1% of all bikers.
I know everyone with a noisy can finds it music to their ears, but unfortunately Joesph Public has a different taste in music and I think noise is our biggest enemy. I was out walking the dog a couple of weeks back in a wonderful beauty spot probably a good mile as the crow flies from the nearest road when the peace and tranquility was shattered by some dick caning a bike with a race can, you could hear him for bloody ages, it annoyed me as a biker, I bet a few of the ramblers and people on river boats may have felt like writing a letter to their MP because of that one noisy bike, although it was one annoying bike on a two hour walk, this would be written up as
gangs of motorcyclists who drive in a wreckless manner with no regard to road safety. speed limits or other road users.
To give Mr Rigby his due he at least notes the noisy exhausts as being illegally modified.
The worst thing is politicians listen to people like this, and that is bad news for us, noise limits, power limits, speed camera's

all stem from complaints such as Mr Rigby's.
The Police clampdowns are even worse for us, they always go for numbers to report back with, so instead of finding 5 or 6 c**** and throwing the book at them, they find a nice spot where almost every bike will probably be a few mph over the limit and report back that they caught 100 of these "gang members" at the weekend to appease Mr Rigby and co. (not to mention top up some coffers)
I actually think noise is responsible for 90% of the bad feeling, so many bikes sound like they are going far faster than they are and most non-bikers probably judge more on this than anything else, "if it is making that much noise it must be doing 150mph" four cylinder bikes by far being the worst, booming twins just sound loud and to many are less irkesome.
European motorcyclists seem to be far less self destructive to their own cause and benefit greatly with much less hassle from the feds and a much better relationship with the non-biking public
Perhaps we could all do a little to cause less frustration to Rigsby and co.