He is not that kind to her in the songs and he openly discussed and some say slammed her in the BTM episode
But, and in any event, all parties here are airing their laundry in public and not just in songs. LB and La Nicks always use their "former relationship" and the drugs to sell their records. Hell, La Nicks is even rehashing hot pictures of herself from the latter part of that era to sell her current rehash
In the end, Carl Ann was there and it is her story to sell, just like La Nicks and LB use the goings on in that era to sell their current music.