I have apologized to my T for certain things and it did make me feel better. He said I didn't have to apologize, but when I said I wanted to, he was quiet and let me say I was sorry, and he thanked me and accepted my apology graciously. And we were done with it, and moved on!

I don't think wanting to be the delightful client is necessarily a good thing in therapy. It could lead to not being honest with your T and hiding your true thoughts for fear they will make you appear less delightful. Once my T told me that I didn't need to "perform" in therapy. I see trying to be the delightful client as kind of like that. But I do think it is a great goal to try to develop communication skills in session that are functional and healthy and that you can then go out and use in real life. So learning to be able to say things directly and respectfully would be great, instead of with judgment or sarcasm. Maybe you could ask for your T's coaching on how to communicate in the way you want. Like if something comes out sarcastic, you can say, "wow, I'm sorry, I didn't mean for that to come out that way. how can I say that more respectfully but yet still be honest and confront the issue?"