Your interlucotur clearly wouldn't be behaving nicely and would clearly be pushing for some confrontation - but does it mean that it is wrong or not allowed? This feels the same as if (s)he simply and directly called you a jackass in your face - it is an insult and potentially hostile, but it's clearly legal and 'allowed'; there are often quite understandable valid reasons to (re)act in such a way against someone, and it wouldn't really be an excuse in a murder trial (and the original problem does involve murders as reaction to perceived insults).