I agree that you're free to ignore anything you chose. I don't think you should have to ignore something though, especially if it's offensive. I don't think someone complaining about another person's signature, expanding that to broader personal attacks, and attempting to justify it with "that kind of thing doesn't fly here in Alabama" really does much to build community. Yes, I can, and did, put that person on ignore (bless her tiny heart). But if we're all just ignoring each other and scrolling past bad behavior there's little point in being here.