For as quick as his thumb was, so too were Hestia's tears and she though she wasn't opposed to showing emotion by any means, she really didn't much like this, as she wasn't a frequent crier but felt helpless to stop it. Any attempt to get it under control was just set off again by the things they said, which right now just felt more like an argument that anything else.
"You just want to argue with me!" Or, conversely, she just wanted to argue with him but that wasn't how she saw it at all right now! "Argue with me and take jabs at him whenever you get the chance!"