If Greta Thunberg flew on a commercial airplane somewhere far away, she'd be accused of being a hyprocate, so she uses a sailboat to cross a freaking ocean when she wants to.

This may be tribalism purity from the part of conservatives, but that's always going to be the reaction from the "opposite" side in this kind of situations because that's the obvious human response. This is not silly logic, this is how humans behave and if you refuse to believe your eyes when you see this again and again, you're the one being silly.