I don't have anyone on my ignore list, largely because I stay away from the soapbox forum. I think I would be tempted if I visited it often.
Mostly I have enough people to argue with in real life and I don't need to start fights with people I haven't even met. Of course if I feel extremely strongly about something, I may say something, but so far that hasn't happened.
This is the only internet forum I visit on a regular basis. I have learned a lot from it and hope to do my part to keep it positive and constructive.