Just FYI, Greta Thunberg is considered persona non grata now.
She always seems more of a drama activist than a real activist but she has every right to be that. If her drama gets more young people involved in environmental issues it’s win-win. I bear her no ill will, but I don’t seek out news about her. So she’s certainly not considered with a blanket status of “person non grata”
By whom? She is still one of the world's foremost figures in the fight against climate change, but also in other activist fights (like the fight against apartheid in Israel).
Here in Germany she is considered an antisemite now. All the Green party allies have publicly distanced themselves from her.