It makes sense, he did grow. He grew a lot.
I think in Season 6 he shows some of his best parts: he cares for his students at the start, he is sober and trying to be nice by the end, I think he’s not a dick to anyone at the last episode.
He still has ups and downs, tons of them. Like he keeps going out with Vince Wangoner which is one of the worst persons in the world. He’s not perfect, he’s not even good on my standards, but he’s improoving and that’s worth something.
They went waaay to far. Things should be weird between them but not straight up hostile, and he should have apologized for thinking he is owed a coming out.