Maybe they’re shouting and screaming. Perhaps they’re annoyed. Or instead you're scuffling with sentences.
And maybe it’s not fair. Sometimes you need to defend the truth to the end… sometimes.
In many cases, even when things don’t seem fair, one excellent thing you can do is agree with them, at least to start with. Humble yourself and validate their opinion. Accept your own shortcomings. Apologise.
Try it; you may catch them like a [insert common cliché about an animal with antlers].