We can't give a blanket answer to this because we have no idea what might come up that simply goes too far.
We're going to go out of our way to facilitate dialog, even if that dialog comes from fear, anger, resentment or other premises that aren't usually very flattering for us. We may not always be able to answer it, but we don't want to shut it down unless we must.
But we do reserve the right to pull the plug on something if we decide we're just the wrong platform to host it. I can't even paint a broad picture of what definitely will not fit because it just doesn't happen enough for us to have explored it.
There are lots of ways things can harm you, including just exhausting all of your available people resources. Likewise, organizing a protest or boycott is a few levels of escalation above dialog - so we're probably not going to be a facilitator there.
In short, Meta is a place where we essentially hold most of the power; what you've got is your power to persuade. That could be:
- Persuading us to do something you want
- Persuading others to like your feature idea
- Persuading others to reopen a question
... we don't want to inhibit your power to persuade because that breaks everything. That's why, from time to time, you see some REALLY unflattering things directed at us.
But once you get to the "I'm done talking!" stage, it's probably more forcing than persuading, and that we just can't host.