Source for the curious, many more online and on YouTube (including often helpful role play videos, strongly recommend for practical purposes): https://www.talkspace.com/blog/grey-rock-method/
It took about... 5 years? Maybe more? For me to learn to use the principles well, whatever you wanna call them.
These issues go core-level deep!
But yeah, grey-rocking & medium chill are effective strategies to create & maintain the necessary distance to endure the onslaught from covert/ full-blown/ any and all narcissists. Granted, we all got bits and pieces of that dark side in us somewhere, and all of us will have to learn to address it sometime and to whatever extent it impacts us.