The parent is referring to a part of the broader notion that some people feel that some other people have over-extended the use of accusatory terms. It's a segment of the SJW/wokeness/cancel-culture/left-vs-right thing. E.g. the word "violence" was used by somebody (I forget the case, but it was not a legal usage of the term) to refer to something non-physical. "Words can be violence", or something like that. I think "poverty is a form of violence" is also something I've heard. I've seen this criticism made for over-usage of the term "hate speech" too, but only in a sarcastic, theoretical way. I've haven't seen the actual instances of the term's misuse. Similarly, I haven't seen cases where the specific term "domestic violence" was over-extended in any popular or legal context (though they may exist).