No need to be rude.
Linesmen have been told not to raise their flag, and refs not to blow their whistle, right away on close calls, specifically to allow VAR to review the incident.
The comments not understanding rules was not aimed at you in particular, just in general.
I reckon it will be at least into next year, after the 50th exact same example of handball is given, that some people may just start to understand the laws have actually changed for example.
In specific example above I cannot see your issue here at all though, apart from wrongly criticizing a decision. You said diabolical decision why goal was disallowed and couldn't understand why referee blew, but it was offside, even if was probably a bit tighter decision given by the assistant than usual so far this season.