Question:
What exactly is batgumani? And what does it mean when it says it’s not allowed?
Answer:
Batgumani means to think bad about someone. Eg. he/she is stupid, ignorant, a faasiq, zaani etc.
It’s not allowed means, under normal circumstances you should think good about others, that they’re better and more pious than myself. Only when there is some dealing with someone, that you should be cautious.