Not really. Stoicism is first and foremost about how you deal with yourself. Gray-rocking is a tactic for dealing with others. I suppose it fits with Stoicism in that dealing effectively with others can be good for you.

It’s different in application. Grey-rocking is where you maintain firm boundaries but otherwise refuse to engage in drama.

This has the effect of completely disabling people who thrive on causing drama, or people like my neighbour who only seem to be content when everyone else is making accommodations for her poorly-behaved kid and/or telling her how hard her life must be.

People like that will decide one day that they’re not getting enough attention so they will create situations where they have the opportunity to be offended about $issueDuJour. Grey-rocking prevents them from their parasocial behavior using you as leverage.