So for Labor Day my bfs aunt and uncle invited us over for dinner and told us to bring Delilah. She's been over before and was fine just sitting in my lap. Well yesterday we went and she started yapping at his uncle so I took her aside to do some counter conditioning as well as some obedience drills and that calmed her down. Well she went over to his uncle and let him pet her and was being so good and then he GRABBED her tail and started yelling "got your tail, got your tail" which freaked her out and she darted away and air snapped at him. So I took her to the other side of the yard to calm her down and do so training and she was so good and focused and calmed down right away. His uncle walked by and started making barking noises at her. Which triggered her yapping again. We ended up leaving early. Who the heck does that? Even if you think teasing dogs is okay, if you see an owner trying to train their dog to stop doing something, you don't go interfering with training and encouraging the dog to do that thing. He has the mentality that 1) all dogs like being teased and think it's a game and 2) he's a human and she's a dog so she should put up with whatever he wants to do to her because of that.