@rich4u2 I can relate, I feel like it's easy to tell if someone wants to be approached or not, especially if you see someone sitting far away and do not show any interest in joining the activities there.
I get that people try to be nice, but they should put more effort in recognising who they are approaching.
My dog is also reactive, and we have been working a lot to socialize it, so we've come a long way, but it was tough in the beginning, and people who didn't respect any boundaries made it worse.
We could easily walk, and she would pay no attention, but if someone stops us or tries to pet her, she'll start barking.
There's also different type of people who walk their dogs and want to introduce their dog to your dog, I literally hate these interactions, as my dog starts barking aggressively at other dogs she doesnt know that are close to her, and I try everything to avoid crossing our path with other dog owners that walk their dog however they make it extremely hard, as they literally chase us.
Last week I saw a lady walking her dog in the distance, so I decided to cross on the other sidewalk, as soon as I did that she did it too, I was like ok let me go back, and crossed the sidewalk once again then she does it too.. I literally stopped for a few seconds, and as they were approaching, I crossed on to the other sidewalk... again.. and guess... she does it too.
It was obvious that she wanted our dogs to meet as she was staring right into us, so I just picked my dog up and went in a different direction.
I don't own the sidewalks, nor I can request from people to make sure they keep their distance when they walk their dogs, but when I'm clearly trying to avoid you by doing all I can to stay as far as possible, just don't chase me, especially if I warned you.
I'm not trying to be rude, nor socially awkward, I just know my dog needs some time before she can get comfortable around new dogs.
Otherwise, she'll just start barking and tuck her tail for the rest of the walk, I know when people are approaching someone else, they have good intentions, but it's just about respecting some boundaries.