We had the "but he's just playing!" line this morning. AFTER I'd asked the person if their dog was OK (I could see it approaching, as the owners altered my by going, oh no, when it started belting towards my dog). While it wasn't aggressive, it was very rude, was massive, had zero recall and jumped all over my (terrified) dog.
OMG if I hear that line one more time ....
These clueless new owners (it was a huge GSD pup) were so lazy they hadn't even bothered to learn dog body language. One look at my terrified girl should have been enough to shame them but ... nope. He's just playing. Aaargghhhhh.
Thing is: training most dogs isn't all that hard, especially a GSD, especially having it from a pup. That person could have the loveliest dog, and the most stress-free, enjoyable walks. For the want of a little reading, You-Tubing or classes they make everyone's lives miserable.
And the thing is, their poor dog will get itself in a situation where the other dog gets so fed up with it "playing" with them that it turns and rips its face off. And then they'll end up with a traumatised or reactive dog, and that is so much harder to manage than one that's polite and has decent recall. Just so stupid and short-sighted.