In reality, a significant portion is exported to developing countries, where it often ends up mismanaged. Claiming developed countries handle "almost all" of their plastic waste without acknowledging this export is detracting from wrongdoings me and you bear responsibility for as citizens of relatively free and open democratic societies. It is not somehow misleading. It is morally reprehensible.
True. The simpler and more exact statement is just: It is misleading. No need for a weaselly "somehow". Here's guessing that's not what you meant, but... Too bad for you, then.
Best way not to come off as a hot-headed zealot who's either ignorant of or intentionally twisting the truth is not to behave like a hot-headed zealot who's either ignorant of or intentionally twisting the truth.