For whatever "Flutter Brutter" is trying to accomplish, it isn't working. Zephyr, also know as Flutterbro's (and Fluttershy's parents) character designs aren't too interesting, but that takes a backseat to the episode's jaded characterization.
Zephyr does very little to win anyone over. I like the concept of a struggling creative mind trying to grow into their own shell, but Zephyr is not a good example. He's less of a "struggling artist", and more of a compulsive jerk. He hits on Rainbow Dash despite her clearly not having any interest in him. He gloats about himself constantly. He treats his parents like 'bros that let him crash on their sofa. In one scene, Zephyr destroys his father's prized cloud collection to build something for his own gain. This isn't a guy simply down on his luck - this is a guy abusing his parent's kindness to pursue his own desires.
The episode doesn't try to salvage his character until the tail end. We get a song, which is catchy, well-sung, and overall really enjoyable, but its message is confusing. If we are to believe the lyrics, Zephyr is a swell guy, he just doesn't put enough effort into his passions. But this doesn't make sense. We've seen that Zephyr has gone through and attempted countless business and creative pursuits - he just failed extensively at all of them. The episode didn't convince me that Flutterbro's problems lay in his lack of effort. He has an ego problem, more than anything, and likely a strong lack of empathy and self-awareness.
It's a bad episode headed by a sketchy new character, but one pony that does shine is Fluttershy. Throughout the episode, Fluttershy stands up for herself and others. She isn't taking any of Zephyr's crap, and she doesn't back down from speaking her mind. This was very refreshing to see, and it made Zephyr's actions a little more tolerable to watch