Probably an actual unpopular opinion:
Even though I love Thunberg for all she's done for the world – so much more than I ever will – in this one tweet that is going around she is a useful idiot for the far right and doing exactly what the guy she's dunking on wanted. The only one who gains anything of consequence from this is that guy, the hatefueld world view he spreads, and his far right friends. No matter how many lols this gets from her supporters, it's not worth making him more known.