It might also be that they just agree with you to not get into conflict with you because they know you won't want to see their perspective, and once you're done

It might also be that they just agree with you to not get into conflict with you because they know you won't want to see their perspective, and once you're done with your monologue they happily move on to the next person and you don't even realize they didn't care anything about what you told them