A girl came back from a trip. I asked her if it was fun to go there, and then she got angry.

Well, maybe she doesn't like your spit and jokes, but she didn't have the courage to say it before, but this time she went out to play happily and shared it with you, and you spit again. She just played with too much water, so you spit, so she was unhappy. Actually, sometimes, jokes should be enough. You can joke freely if you are not a good friend. You should be measured and know the bottom line. Maybe you can have a good talk with her and ask if you don't like the fact that you often make fun of her and spit on her. If that's the case, I think you need to apologize and stop making fun of her, if you still want this friend.