As a dog owner, I'm sick of it.
"He's friendly"
"He just wants to say hello"
"Dogs need to play with each other"
"Oh he never listens!"
"It'll teach him a lesson if she goes for him"
I'm sure there's more, but they're just piss poor excuses for not bothering to either train your dog, or keep it under control if training isn't good enough, or interact with it while you're walking it.
I mean why bother having a dog if you're not going to interact with it? If you expect everyone else to entertain it for you? Other people to teach it a lesson? If you're not going to teach it to listen to you or if that fails (because it's not always bulletproof) then use other methods to keep it safe? I mean if it never listens what are you going to do if it runs towards a road?
There's so many people with high energy, high prey drive dogs who think that endless walks are the answer, go to the same place day after day, don't interact with the dog or engage it's brain by providing activities that satisfy it's breed and then wonder why they have a very fit nut job that gets over excited at the sight of something different like another dog, person, horse etc. Or worse they don't even realise that's not how a well adjusted dog behaves and think it's cute or funny.
Many also don't understand basic dog body language, the amount that I've been told are just being friendly when in fact they're being dominant and sometimes aggressive. But the tail is wagging so the owner thinks it's all good because they're not looking at the rest of the dog or understanding what they're seeing.
I will tell an approaching dog no, and block it, and I don't care if it offends the owners, if you're not going to control your dog, I'm going to advocate for mine and they don't want or need to be jumped all over or be at risk of being attacked.