I've had this happen to me.
It was when I was just lying around on my Zira, and this person must have noticed I had a group for Outsider characters. This group was only meant to be able to find close friends that played canon or OC Outsiders from TLK, so it was more like a network than anything else. I explained it to the person, who'd arrived on a wolf character, when they asked. They said they had a lion "Outsider" who could join the group, then disappeared for awhile, before coming back on a male lion OC. I asked them for a bio, etc etc, genuinely interested on rp-ing with another Outlands-style lion, but when I asked their rank they said they were "alpha."
So yeah, I told them that "alpha" was not a rank. So they asked about becoming a King, and I told them point blank that this group was based on a movie, Zira was the leader, and we didn't really accept "alpha" lions or kings. We didn't work like a wolf pack. They got a flustered, telling me that my group was tiny, saying passive aggressive things like "gee I wonder why you have no members" and whatnot. I basically just said if this wasn't the kind of group they were looking for, and they weren't willing to give it a shot, then they were free to go.
That's probably the only time I've ever had someone get that riled up over a leadership position. Most people understand what my group's based on. xD