Um, yes there is. Most people don't become indefinitely hostile to other people for single transgressions, in this case even pretty trivial if we include white lies. They also take apologies, which I assume Carinthium doesn't do.

To be more precise, labelling this particular boundary and approach an "Utlimatum" seems altogether too arbitrary to me. The differences between Carinthiums liar avoidance and normal behaviour is not one which makes using that label appropriate, especially in the context where the label is emphasised with righteous indignation and zero tolerance rhetoric.