I was pretty certain Dash learned that lesson already in season 2...and in that particular episode, she wasn't being treated like dirt, in the episode where she is supposed to fulfill her dream.
I guess I missed the first parts because of the stream... so the showboating wasn't really there :/ hopefully the episode makes more sense when I re-watch it all the way? XD
She honestly didn't showboat THAT much. I mean, she was excited for fulfilling her dream, she made a mistake or two and then the Wonderbolts bullied her. It really wasn't nice to watch, for me.