It also appears that Mr. Jetson is trying to insinuate that computer network "collisions" would directly translate into PRT "collisions". It's another blatant scare tactic.
Arguments like this might sound ridiculous to anyone with a technical background, but these tactics do have an effect on the general public -- people who don't know better might think that PRT designers are actually designing for collisions! That's why people like Avidor (and Jetson, if indeed he's a different person) must be answered wherever they appear. If their absurd message goes unchallenged, it has a better chance of being accepted by the masses.