Whether it was praise or insult, the two saints of the West cared not, treating them as fleeting as a wisp of smoke, open-minded indeed.
You could say they were thick-skinned, but you could also say that their realm was lofty, unaffected by all things, an embodiment of profound insight.
As for how to understand it, it depends on one's relationship with the two saints of the West. If they were viewed with enmity, they would naturally be seen as thick-skinned, completely lacking the demeanor of enlightened beings.
If they were worshipped, they would naturally be understood as beings of profound insight, unswayed by mere words.
...
...
After a long while, Empress Nuwa finally said, "At last, I understand today why the Sanqing, clearly stronger than you two, still can't outcompete you."
"Because the Sanqing have face and act with a bottom line, while you don't and you act without any bottom line. How could they ever outdo you?"