Use Forge's clientSideOnly feature

This feature sets an appropriate DisplayTest and ignores the mod on dedicated servers, handling the sided loading for you so that you don't need to worry about it.

forge/src/main/java/com/blamejared/controlling/Controlling.java

@@ -2,24 +2,12 @@
 
 import com.blamejared.controlling.events.ClientEventHandler;
 import net.minecraftforge.common.MinecraftForge;
-import net.minecraftforge.fml.IExtensionPoint;
-import net.minecraftforge.fml.ModLoadingContext;
 import net.minecraftforge.fml.common.Mod;
-import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent;
-import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
 
 @Mod("controlling")
 public class Controlling {
 
     public Controlling() {
-
-        ModLoadingContext.get()
-                .registerExtensionPoint(IExtensionPoint.DisplayTest.class, () -> new IExtensionPoint.DisplayTest(() -> IExtensionPoint.DisplayTest.IGNORESERVERONLY, (remote, isServer) -> true));
-        FMLJavaModLoadingContext.get().getModEventBus().addListener(this::init);
-    }
-
-    private void init(final FMLClientSetupEvent event) {
-
         MinecraftForge.EVENT_BUS.register(new ClientEventHandler());
     }
 

forge/src/main/resources/META-INF/mods.toml

@@ -2,6 +2,7 @@ modLoader = "javafml"
 loaderVersion = "${FORGE_LOADER}"
 issueTrackerURL = "${GIT_REPO}/issues"
 license = "MIT"
+clientSideOnly = true
 [[mods]]
 modId = "${MODID}"
 updateJSONURL = "https://updates.blamejared.com/get?n=${MODID}&gv=${MINECRAFT}&ml=forge"