If i remember correctly, the mc was stuck in a dungeon? And had to kill monster that said funny stuff before doing something, like orc kill human or orc found human. And after that mc said human kills orc. Im sorry if my description is vague but it had been a long time. Thanks before
I feel like SSS-Class Suicide Hunter has something like that, but it is probably Infinite Competitive Dungeon Society. They both talk to their monster opponents. ICDS' MC does it because he had to stay on the same floor for 5 years, so it is more of a habitual taunting. Suicide Hunter's MC only does it because he isn't very strong.