I mean I'm not surprised she went to defend them.

While she may be spoiled and lived from Tony's money, people seem to forget that when you take everything away, she's still his daughter. Obviously, she's aware of what he does and who's around him, but in that scene, Finn says that they acted like animals, and by extension, he thinks the same of Tony.

If anyone told me the same about my dad I'd lose my shit, and I'm pretty sure 99% of you guys would as well. And it's not without a reason!