The "she is unlikable" argument is just working backwards. It is a mechanism to criticize climate activism without having to talk about the ways in which climate change is a crime against our children. There is no possible behavior that she could take that would not produce this "she is unlikable" response except to never speak in public whatsoever.
I will. I am not demanding that you end up as a supporter. What I'm saying is that I do not expect that me choosing different words would make you a supporter even if I tried.