People do that, all the time. At least there’s a significant effect from alcohol, but go to any cancer treatment center and see if the ashtray outside is empty. It’s not.
But no, I don’t really see how an American who can afford tickets is blowing up their life by doing so. Someone’s life, sure. And that matters a lot, but they probably also buy clothing and shoes, so they’re most likely already benefiting from slavery. There’s no ethical consumption under capitalism.
That’s not a reason that people should use to just do what they want, but people also don’t deserve abuse for not boycotting the things you boycott (nor will it help convert them)