Not when they are fake Americans and have an agenda to harm US.
That's beginning with a lie. Otherwise, they have a right to comment if they identify themselves and not necessarily by name.
One has to consider the source.
Alex
"There is a cult of ignorance in the United States, and there has always been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that "my ignorance is just as good as your knowledge."
-- Isaac Asimov