Maybe I'm not picking a good term / elucidating properly, but the second type of "social credit" is the fostering of a favorable view, building good rapport with your manager. Your manager does not put you in a meeting for shits-and-giggles, either because there is a real need or as some impotent display of power. For the latter, when you walk out you're making some strife and come salary review time, vacation request time, etc. it can bite you in the ass.
This can and will have a chilling effect on the efficacy of the "Fuck Meetings" rule. However, it does make clear the culture and expectations of the organization, so hopefully those managers would eventually shape up or ship out.
I get what you're saying and not sure what the right word for it is. Basically, it's showing them 'respect' or whatever for their position so that eventually when you have to have something that matters to you signed off on, you get it. I think social credit is a decent phrase though there might be a better one out there.
However, at my current job we frequently have little meetings here and there post-standup for clarification, discussions, analysis, of issues, etc. Frequently they do not apply, but I do not find myself willing to leave despite explicitly being told I do not have to be there.
It's hard to walk out of a meeting, when you know how it looks, because your manager is the one to handle everything from vacation requests to promotions. Building up "social credit" greases the wheels later on when you are the one who needs something. Unless your manager is a proponent of the policy, you're fighting the tide.