system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Do people who sing off key hear themselves singing on key? Do they hear other off key singing as on key?
gpt
*Musician

There will be people who do think they're in key but still singing sharp or flat. Sometimes its due to change in hearing from aging but also could just be an untrained/lazy ear. 

Theres probably many people who know they're out of key and have no business singing in the first place, but simply don't care because they can't hear the horrible dissonance they're creating.