I think I used to have a low tolerance for people who wouldn't let their dogs socialise and I also had a "the dogs will sort it out themselves" attitude. But then I did have a dog who often got into scuffles - usually instigated by her - and never actually bit or got bitten herself, so I had a pretty high tolerance for that kind of aggressive display. But I had no real understanding of what real DA was.
But talking to people who have/had DA dogs has changed my outlook quite a bit. None of those people intended to make their dogs that way, in some cases it was caused through inexperience (which I can relate to), in other because of events that they had no control over. But they still want the same for their dogs as any other owner who loves their dogs.
I have no sympathy for people with DA dogs who don't do everything possible to prevent their dog attacking other dogs. But I have lots of sympathy for those who do and are subjected to people who do not respect their right to take their dog out and keep them away from other dogs. Because it is already so much harder for them to meet their dogs' needs.
I also would never get annoyed for a dog growling or snapping at my dog to tell them to back off. Rarely happens to Banjo because she can spot a grumpy dog from miles off and tends to just stay away from them. But it happened all the time with Luna.