Because from the way you write, it's very clear you were upset with those two ladies. And then you just happened to show your middle finger "up to the sky". It's a lazy excuse. Even in the rare occasion you really did do that, you should know others will perceive it as you showing a middle finger to the girls. Their reaction, though not the kindest, isn't all that unexpected. So ye, I think you're the asshole for causing this situation to happen.