How annoying is it if your neighbour sticks a tumble dryer vent out the window?

Personally I don't think I'd care, but maybe I'm bias because I'm the one wanting to do it. I'd appreciate some opinions. My window is close to the neighbour's doors, it's a little one space parking space/ shared backyard including 3 front doors and my window in the corner, all ground floor level (the car space isn't mine but the rest is shared and has the bins.) Would it be rude or would you just not really mind? I know I could just ask them but I feel like they'd say something like "well now you've mentioned it.. it is unpleasant." But it's just so cheap and easy compared to going to the laundrette. I bought a nice lint catcher attachment for the end so fluff doesn't spray out but I dunno if they're just putting up with it or genuinely aren't bothered