Sasha comes across as one of those types that hates being famous. Like, she obviously enjoys performing and being in front of people and the money etc. But unless someone's writing a check, leave her the fukk alone. She doesn't seem like she's put any time into learning to deal with fans outside official venues.
Yeah she could have done a little wave. You see a lot of famous people have mastered the art of the friendly wave goodbye: big smile, say thank you, waving all while keeping it pushing to wherever you're going.
That said, don't stalk people. Have some damn self respect. Also, as far as celeb snubs go, this was minor. They didn't get cussed out and no one threw hands, so get over it I say.