The title is referencing the video linked in the other reply. Everyone was looking forward to Greta and Trump meeting and her shaming him for “climate”. But he just walked right on past her. Didn’t even acknowledge her presence. It reminded all those watching that she is nothing more than a petulant child that has been given a platform from which to throw tantrums at specific political opposition.

TL/DR - Spoiled kids like this only have as much power as you give them.