It seems ignoring Mods/Admins is possible. Is there a way to prevent it?
Yeah, that was my recollection as well. Haven't had to test it in a long time, but I am sure we had some fuss about it when a member who is perpetually baiting people (currently on an 8 month involuntary holiday from the forums) realized he couldn't ignore the mods who were telling him to knock it off.AFAIK staff can not be ignored by default. You might have a addon or style conflict.
It's recommended to have the Registered group as the primary user group for everyone and have other groups as secondary groups. That's how the XenForo permission system was designed. It's also more difficult for XF staff to assist with permissions issues if you don't use the recommended setup. If you're not confident as to how you should correctly use this, this guide is helpful.I just recalled that I'm using the Admin & Mod groups as primary user groups