Given Hank's reaction to having deformed feet, I would have thought that transforming into a big blue furball would have brought on some kind of nervous breakdown. He took to it a bit too well IMO. That being said, he indeed looked bad ass.
Did you forget that he completely obliterated the lab after he turned furry? And his bursts of anger meant that he was not at ease with himself? Not at all. Get it out of the system Raaah!
If he had to take it well, it's for several reasons. It was the next day - the Cuban missile crisis. Is he gonna call in sick?

And he was the only one who could pilot the Blackbird.
Set his own issues aside for the time being, I suppose. If he's gonna address this in the sequel, I think we'd be treading old ground anyway.
More importantly he had to suck it up because, to me, he'd realised that he had treated Raven badly the night before and was on that high horse about beauty and fitting in. And it backfired on him. He realised he was a bit of an insecure jerk. And seeing Mystique being accepting of herself, was probably caused him to have to suck it up in the first place.
Loganbabe, it's funny that you always have a different interpretation of things compared to the majority. Well, Mystique's call, 'Mutant and proud!' to Beast was
not meant to be derogatory and spiteful. In the hangar she even said that this is who Hank is, trying to make him feel better about himself. She was tender with him too. So to say that line with your view makes no sense at all. Her tone certainly didn't indicate that she was immature and wanted to put him in his place.
It'd be hypocritical if she were saying that if she was the one tooting the horn about needing to fit in her own skin. Why would she make someone else feel worse about themselves if she had already for the most of the movie felt uncomfortable in her own? Heck, even Hank told her the night before that the shapeshifting form was not beautiful! He laid the gauntlet, if you will! It still doesn't make Raven the worse person, and neither was Beast. His self-acceptance was his way of saying 'sorry' to Raven, because he's now blue just like her, and therefore realising that 'this is who he is.'
If that makes sense. She is
not undeveloped either. She had an important arc that played out over the film, more so than the kids, poignant and thematically relevant. So you're saying that one line just unhinged that entire development then? This makes no sense. And I don't think they were saying she was undeveloped. That's your seeing what you thought you were seeing.
Raven left Charles because he realised that Erik could give what she needed. Charles himself realised he was being selfish and holding her back from what she felt she could fulfill. Since Charles had different ideals from hers. He was doing her a service by letting her go, fly the coop so to speak. Raven didn't ask him if she could join Erik's. Remember, she went to him first. Charles in fact gave 'permission', so it was okay for her to go. If anything, it made Charles noble and sacrificial. Raven never asked for anything more than true acceptance from her brother. If you were the one with blue skin and scales and walking around in the public, would you really do it unreservedly? And Charles knew he 'held her back', sure for good reasons, but she can't hide the fact that she's different. And that makes her unhappy. That's why Erik saw differently and made her realise, for the first time ever, that she could shed her insecurities. It's a great irony: to be able to shapeshift to fit in, but not really being able to do so because one is being perceived on false pretences. And Charles understood that. By giving permission, he saw nothing wrong in that.
I apologise for being a little frustrated, but what movie were you seeing?