Not sure what things like 2 ton wanker tractor or the likes has to do with it but the cycling community love to throw them out there and drivers don't get offended, take it as a term of endearment.
In BO's defence Berni, I think he was exclusively talking about the ''White Range Rover'' brigade, who seemingly have no self awareness as many of them are far too busy taking a selfie to upload to ''the gram'' and putting their teeth whitening light in their gob, to be concerned with actually driving their ''2 ton wanker tractors''
I'm sure there are some people that do drive White Range Rovers who are very very conscientious and aware drivers but it tends to attract a certain type of narcissist. Doesn't help when half of the cast of TOWIE, Love Island and Jordan drive one.
But yeah, I am 99% certain BO meant those types mentioned above when giving that pet name, rather than using it as a cover all for all drivers