"Being descriptive about behavior" can certainly be a personal attack. It just depends. Most of us wouldn't like the worst behavior we ever did to be repeated in every context that we were mentioned.

More importantly, disingenuousness is not a behavior. It isn't something a person says or does. You have to infer it from something they say or do. Internet users are far far too quick to make this leap, and it breaks the site guidelines to do that on HN.