Liam didn't realize it, and he would address much of it to his mental preparations during his seclusion, but the social interaction would have been impossible for the old him.
Liam had shown uncompromising decisiveness, sticking to his necessities despite the confusing gibberish that reached his ears.
There had also been confidence, unaffected by inexperience in those social aspects of life. Truth was, the time in the Sect had provided that experience. Liam was still clueless about much, but far from lost.
Lastly, Liam had shown a vague social sharpness, obtaining exactly what he needed through mere words without committing revealing mistakes.
Of course, Liam's superior cultivation had played a major role, preventing conflicts. He would have never won a proper argument, not with words.
Also, Liam knew exactly what he needed and what to avoid, preventing useless thoughts that would have complicated the social interaction in ways he didn't know how to tread.
