I can tell you that during my own journey trying to Be A Better Me it took time to internalize this kind of communication framework, to stop feeling like I was putting on a front and instead make it flow naturally as if this is just a part of my personality... because it did become just a part of me.

I have acquaintances from "the before times" that feel slightly put off by this aspect of present me, because they expect me to react more impulsively (or more "real") like I used to do. Nobody's wrong here, just mismatched expectations. Now that they see this is "really" me and not a mask I'm putting on, it leads to some gentle ribbing and that's it.

So putting myself in both your shoes: maybe your friend needs time to translate the core concepts of this into his own grammar and vocabulary, and it takes to acclimate to that from the outside too.