It's a frustrating situation, but the cleric isn't wrong either. If they are killing the mobs that they are claiming, that demonstrates the group has the required strength to hold the camp without needing extra warmbodies.
I had a similar situation in MM 2 days ago. My brother and I duo'ing graveyard and pulling from pit below CE also. There's a group at pond pulling canyon already, there's a group at CE already, and there is another duo at tower/caitliff. We're already keeping down all the mobs available to us without pulling mobs over the top of other surrounding groups, but like 5 people showed up and got salty we didn't invite them. /shrug
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