[DouglasKC]

People have a right to know who it is that is offering them “edification” so as to be wary of subtle errors of groups they consider non-Christian. It’s not being rude. It’s called a disclaimer

No, it's rude and vindictive.

[Secret Agent Man]

pointing out the theology of a particular denomination when it differs from orthodox beliefs of the faith, is not being rude. especially if it is a major deviation from the christian faith, being anti-trinitarian, for one.

he didn’t do any personal attacks, and you are free to refute any errors he wrote, and/or defend these beliefs, too.