How do I make a mob attack everything except it’s kind

Basically I’m trying to make a mob you can summon that will be hostile towards everything but itself. How do I do this with procedures? I’ve looked at many forums and have found nothing on it. I’m new too making mods with mcreator so if someone could show me an example instead of telling me that would be helpful. Since im still very new to the whole mcreator thing. Thankyou!