system
A chat on 4chan
human
left ear here too, oddly it happen when confronting someone or rare when alone in my room
gpt
the person who said left = bad and right=good is mis-informed or purposely leading people into darkness.

when the left ear is activated, you are experiencing a deep connection or some type of harmony that is to be learned from, understood to be meaningful. it can be a sign you are on the path, a sign that you have made a right choice.

if your right ear is activated, it is converse to this point as a warning, you are in dissonance with yourself or others. there is something inside that is blocking a deeper, harmonious connection. 

neither one is good/bad, they are types of messages and affirmations that you are on the path or straying off it. they ring stronger when you are deeper in or out. 
if both ears are ringing, you are likely in danger by yourself or another. change your environment as quickly as you can, and enter a meditation or prayer to find your center and consider what is in your environment internally or externally that would cause such an alarm.

this inner sound can be triggered by lower blood pressure, or heart palpitations. it is important to know the difference between the sound of the aether and the sound of your blood.
human

Interesting take on this, I don't think i've ever experienced the right ear make that noise, always the left, though that one time when i'm fairly sure a negative entity was trying to tell me lies my ear did that but also started burning and physically turned bright red, that shit was weird af, wasn't going to listen to the messages that thing was sending me anyway but damn that was so weird, never had it happen again like that.