Ok, was I being a bit of a dick here? lol
Queue into The Meso Terminal on WAR. One of the first pack of mobs always spam these circle AoE's and my lazy ass just tanks them since I can just use my abundance of healing abilities to heal myself back up immediately after. I suppose this didn't sit right with the AST though, since right after I pulled the first boss I got this message.
I meant this as in, I could take care of the "optional damage" myself and the healer didn't need to worry about it but, I guess they took it the wrong way because from that point on the AST completely stopped healing me. No big deal though, I just continued to mitigate and heal with my own abilities and we successfully completed the dungeon with no issues.
I scrambled to explain myself better after the final boss but the AST immediately left.
Honestly having to use my full kit to survive for once was actually kind of fun. First time tank? I just finished the dungeon with functionally no healer, surely that is at least a liiittle impressive no? /s But hey at least the DPS got my back, love that guy!
Edit: I wasn't paying attention and said SCH instead of AST when making this post.