Isn't she just some girl that advocates for more people to care about climate change? Which is almost universally agreed upon to be a problem, as it is a fact. I could understand people attacking her because she's left/right and is talking about political issues (maybe she is, I wouldn't know), but fighting against climate change is like the most innocuous thing someone can do.
She is likely fake and that is intuitive for most people.
By fake I mean that she is a tool of adults. From what I know, her family are jewish showbiz people and of course such people want to put on a show and make money, while not caring about the kid or the cause. There have been countless showbiz kids that end up mentally broken and it's gross.
I believe that cause a lot of the reactions but people don't know how to put it into words.
In addition, she doesn't know what she's talking about. I doesn't matter if the topic is true or not, she doesn't know because she is too young. If Bill Gates or some accomplished person when on the same campaign, when they didn't previously make money from it, then it would be more credible.
Also, it's a massively tired subject. I was looking at some famous movie from 1973 and the future was destroyed by green house gases. I was Soylant Green. The original novel was just about over population, but Hollywood always goes for climate change. For fun I watched Buck Rogers the other day. That came out in 1978 and the future was destroyed due to man's environmental issues. My point is that this is a tired media topic that's been going on for almost 50 years.
I am older and have a great memory, so I remember all of this stuff from when I was a kid. Most people have no memory compared to me. They might have watched all of these shows but don't remember, then hear it on TV and WOW! That or the media LOVES to focus on kids. What, we eat animals....I'm vegan now!! And the Earth is going to burn up....OMG!
It is massively tiring and there's nothing we can do about the issue.