fix fish petting (#16094)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/NPC/Systems/FactionSystem.cs

@@ -1,16 +1,17 @@
-using System.Linq;
 using Content.Server.NPC.Components;
 using Robust.Shared.Prototypes;
+using System.Linq;
+
+namespace Content.Server.NPC.Systems;
 
-namespace Content.Server.NPC.Systems
-{
 /// <summary>
 ///     Outlines faction relationships with each other.
 /// </summary>
 public sealed class FactionSystem : EntitySystem
 {
-        [Dependency] private readonly IPrototypeManager _protoManager = default!;
+    [Dependency] private readonly FactionExceptionSystem _factionException = default!;
     [Dependency] private readonly EntityLookupSystem _lookup = default!;
+    [Dependency] private readonly IPrototypeManager _protoManager = default!;
 
     private ISawmill _sawmill = default!;
 
@@ -115,7 +116,14 @@ namespace Content.Server.NPC.Systems
         if (!Resolve(entity, ref component, false))
             return Array.Empty<EntityUid>();
 
-            return GetNearbyFactions(entity, range, component.HostileFactions);
+        var hostiles = GetNearbyFactions(entity, range, component.HostileFactions);
+        if (TryComp<FactionExceptionComponent>(entity, out var factionException))
+        {
+            // ignore anything from enemy faction that we are explicitly friendly towards
+            return hostiles.Where(target => !_factionException.IsIgnored(factionException, target));
+        }
+
+        return hostiles;
     }
 
     public IEnumerable<EntityUid> GetNearbyFriendlies(EntityUid entity, float range, FactionComponent? component = null)
@@ -218,4 +226,4 @@ namespace Content.Server.NPC.Systems
         RefreshFactions();
     }
 }
-}
+