If this movie had been solely written with SW neckbeards in mind, there would be little issue. But it isn't realistic to write a script for Joe Average (the majority of viewers) and then to somehow expect them to suspend their disbelief until the sequel hits.
The problem with the scene was that in order for it to make sense, you have to have outside knowledge that the movie doesn't provide. Everything that you and others are saying is valid, but to the average viewer it wasn't very clear why she went Hulk-mode and whupped his ass. I have some outside knowledge, and it still seemed somewhat vague to me. I'm just chalking it up to bad storytelling, but whatevs.