I haven't got any teenagers yet (DC are 8 and 7months) but I was the teenager from hell. The relationship between me and my DM had completely disintegrated by the time I was 16 and we didn't speak for 2 years, I moved out, over an hour away with an older guy she had never met. Hindsight is a wonderful thing so from the other side and my PoV as a teen these are the things that were the main issues:
No consequences, I could do whatever I wanted, all that would happen would be that I got shouted at for about half hour and had empty threats thrown at me but never followed through. I had no boundaries and as a result just wanted to push them to see how much they cared? To get a reaction I suppose.
As my behaviour got worse she started throwing insults into the shouting. I think to shock me, but you really don't need to hear that from your DM!
She was is very controlling. Now I'm older I can see she is a very anxious person and it comes from a good place however annoying it is, but at the time I felt that she didn't trust me because I was such a crap person.
We had no quality time together. Both DPs worked full time, neither were interested in things I was interested in or had time for a proper conversation or anything at all to be honest.
My DBro got a lot of attention for various reasons. Again as an adult I can see why, but back then I felt rejected and second best.
It got to a point where she completely washed her hands of me, and it hurt like hell. She didn't say it but I could tell. The only way I knew how to react was with anger, as I couldn't express my emotions clearly or even understand them clearly at that age.
Looking back I was craving attention and affirmation that I was an ok person! It's so hard though, I look back and I'm so embarrassed by the things I did, but the way she behaved also still pisses me off!
I think PP had it when they said, they need your love the most when they deserve it the least