Is our training system that bad that wake turbulence and being cautious behind someone bigger than you is no longer part of the syllabi?
That is the real question isn't it.
I can't answer it, however if people believe it is an issue it should be addressed with training, not more verbal diarrhoea.
To take the ultra light discussion to another level, if you call him and he doesn't respond, (not listening or simply doesn't have a VHF) what are you going to do then, taxi off the runway and allow him (and any other lighty) to depart first in the interest of safety?
It's either safety critical or its not.