Bungie recently changed their policies around banning users, and the role of moderators. It's now a more democratic-like system. Users are mostly free to post whatever they like. However, any user can mute you. They don't have to wait for a mod to find the post and ban you. It's immediate and personal. If enough users mute a single account, that account will become globally muted for a period of time. If you are following someone, you will still see their posts, even if they have been globally muted. If you really feel that a post has crossed the line, use the report button, and it'll get flagged for review from a mod, and can result in a ban for that user.