diff --git a/lib/shared/thread-utils.js b/lib/shared/thread-utils.js
--- a/lib/shared/thread-utils.js
+++ b/lib/shared/thread-utils.js
@@ -175,29 +175,36 @@
   return communityRootMembersToRole;
 }
 
+// This function returns true for all thick threads, as well as all channels
+// inside GENESIS. Channels inside GENESIS were used in place of thick threads
+// before thick threads were launched, and as such we mirror "freezing" behavior
+// between them and thick threads. "Freezing" a thread can occur when a user
+// blocks another user, and those two users are the only members of a given
+// chat. Note that we exclude the GENESIS community root here, as the root
+// itself has never been used in place of thick threads. Also note that
+// grandchild channels of GENESIS get this behavior too, even though we don't
+// currently support channels inside thick threads.
+function threadIsThickOrChannelInsideGenesis(threadInfo: ThreadInfo): boolean {
+  if (threadTypeIsThick(threadInfo.type)) {
+    return true;
+  }
+  if (getCommunity(threadInfo) !== genesis().id) {
+    return false;
+  }
+  return threadInfo.id !== genesis().id;
+}
+
 function useThreadsWithPermission(
   threadInfos: $ReadOnlyArray<ThreadInfo>,
   permission: ThreadPermission,
 ): $ReadOnlyArray<ThreadInfo> {
   const loggedInUserInfo = useLoggedInUserInfo();
   const userInfos = useSelector(state => state.userStore.userInfos);
-  const allThreadInfos = useSelector(state => state.threadStore.threadInfos);
-  const allThreadInfosArray = React.useMemo(
-    () => values(allThreadInfos),
-    [allThreadInfos],
-  );
-
-  const communityRootMembersToRole =
-    useCommunityRootMembersToRole(allThreadInfosArray);
 
   return React.useMemo(() => {
     return threadInfos.filter((threadInfo: ThreadInfo) => {
-      const membersToRole = communityRootMembersToRole[threadInfo.id];
-      const memberHasAdminRole = threadMembersWithoutAddedAdmin(
-        threadInfo,
-      ).some(member => roleIsAdminRole(membersToRole?.[member.id]));
-
-      if (memberHasAdminRole || !loggedInUserInfo) {
+      const isGroupChat = threadIsThickOrChannelInsideGenesis(threadInfo);
+      if (!isGroupChat || !loggedInUserInfo) {
         return hasPermission(threadInfo.currentUser.permissions, permission);
       }
 
@@ -214,13 +221,7 @@
 
       return hasPermission(permissions, permission);
     });
-  }, [
-    threadInfos,
-    communityRootMembersToRole,
-    loggedInUserInfo,
-    userInfos,
-    permission,
-  ]);
+  }, [threadInfos, loggedInUserInfo, userInfos, permission]);
 }
 
 function useThreadHasPermission(