Plott Hounds - I think you are wrong. Even if this guy is annoying by your social standards (and you would have no way of knowing), if his descriptions of his mother's conduct are accurate, his mother had a real problem.
I was a decent high school runner (4:08 miler). Very good student too. Went on to an excellent school on athletic scholarship and did reasonably well, and built a life. Not sure I could do it, but I did it. My father horribly abused me in any number of ways (and indeed, thanks to track and field, I escaped on my own completely at age 17). My mother was a substance abuser, her response to the situation. I am in my 50's and while raising two great Ivy League educated daughters I also have ended up raising, or taking care of, my mother all of these years. I say this not to complain, but when faced with descriptions by young people of highly flawed parents, I am reluctant to dismiss them out of hand. There are benefits to age and experience in terms of perspective, but look, some parents really are highly flawed, and the factual explications by their offspring are often very worthy of validation.
I am not so sure I agree with the original poster's need to discern why his mother behaved the way she did. If her conduct was either due to or exacerbated by menopause issues, she is an adult, and these things can be managed or treated. And if she was not successful in managing the condition, again, she is an adult, and owed it to her family to be as open as possible about what was going on. She may not have had menopausal issues either. She may be just a narcissist, in which case there is nothing the our original poster could have done, no matter what. In any event, the original poster appears successful (a common thing on this board as runners are disciplined people), has a great father, and accordingly likely shouldn't dwell on the etiology of his mother's behavior. One of the significant good things that came out of my background is that I learned early on to have a relationship with my parents (divorced too) on my own terms. I have no hate or bitterness towards either of them, something not easy to do, by the way, but my mother is at heart a warm and nice person and one that I choose to have a relationship with, again, on terms that I set and which hopefully reflect well on me too.
My odds are on the original poster being very accurate. I wish him very well, and hope he learns to love his mother in a way he can both handle and own (not always possible though).
I also don't abide by the comment that the issue could have been a selfish immature teen. Darn right most teens are immature and selfish. That is why they are 15 and well, adults have the responsibility react appropriately and maturely to 15 year olds. Adults don't have the luxury to scream, yell, act of out of control, or blame the situation on immaturity or the like. You have a teenager? You do the best you can with the cards you are dealt.