Note the difference in names between mother and son. She's Niederer and he's Dvorin.
This is a common element of this particular kind of wacko left rant, where the son or daughter serves honorably in a just cause but the parent- just the one- tries to crap on their service and their cause. The other parent is never consulted for an opinion.
What do their last names have to do with anything? You are way off base. What is bad is that she is dishonoring him.