Good. It is offense enough that they have priests.
And, when you call someone Teacher -- are you incorrect? When you call some a PhD or Doctor in Theology, are you incorrect? Doctor (gen.: doctoris) means teacher in Latin and is an agent noun derived from the verb docere ('teach').
Not when it is used in the common sense of the word - Anymore than if one calls his Dad "father".
When is is imbued with reverence, when the title is an honorific one, rather than a job description, as it were... Then it is incorrect.
Christ set forth His Church with servants in place of glorified, set-apart priests and teachers. There is no hierarchy among believers... And what hierarchy is there is a matter of service, not authority.
In that service IS the authority.
You know, the handful of people I know to be a true, spirit-filled servants of God are self-deprecating in the face of honors being bestowed upon them.
And they are also the ones who speak with the most authority. It exudes from them as real power. Yet these are always humble and living quietly - with no pomp or circumstance.
They would be dismayed and embarrassed by any such honors. Every one of them would send such things on to the Father, or to Christ, where such things belong.