I have a save from a play thru with the most recent patch and halsin will still have the above world banter with shadowheart even if you don�t talk to him.
The writer confirmed that the banter is sexual so you can�t even think it�s just friendly banter.
It doesn�t help that Shadowheart is so enthusiastic about the idea of having sex with him or him inviting himself with the drow twins after being refused twice and getting disapproval for rejecting him.
It made it feel like shadowheart dosent care about Tav and it made Halsin come across as a creep that won�t take no for an answer.