Was that really necessary? I wonder about what people's lives must be like for them to be so meanspirited for no good reason. I'm on lot's of forums with immature young kids as well as reasoned adults, and it's amazing to me how boorish people can be when hiding behind some screen name on the internet.
What does that say about our society? Is boorish behaviour our base instinct? Are we so miserable in our lives that we need to vent on everyone else, in instances where we are anonymous? Or, is it that the type of people liable to be found on computer forums are maladjusted "techy" "geeky" types who grew up playing alone on computers and/or game systems and never learned how polite society operates?
Granted there are those people who are just as obnoxious in person as they are on line, but, I bet that most snarling forum bullies, would never act the same in public, where the object of their abuse could exact revenge.
The guy asked "Did they show all of him (his face and his expressions) or did they end up cutting the scene up?" He didn't ask for a review of his son's performance.
Congratulations on your son's big break. It sounds like the director was trying to help him get SAG/AFTRA status by spontaneously giving him a line; yes, he can get a card that way. If that interests him, you and he might want to read M.K. Lewis' book about breaking in as an actor.