First, it should be clear that the teaching of Messiah Yeshua is not for the purpose of parsing syllables. In other words, it is not the sound of syllables themselves which we should avoid. Rabbi is not used to mean that same thing in today's Hebrew at all. The understanding of rav or rabbi today is simply teacher . Yeshua certainly never says that the sound of a word is wrong.
Common sense dictates that it is the meaning of the word which is wrong.
So today, it would not be wrong to use the word rabbi as a descriptive title, unless we meant it in the way it was originally intended in Hebrew, and that would be to use the title in recognition of thinking one to have much, or to be my source of supply, as it originally meant. Once again, Messiah Yeshua is not speaking of parsing sounds of syllables. We must use common sense, and it is both the context and the intention of the teaching which must be taken into account. Messiah Yeshua was teaching a broad principle that applies to all titles of people which they perceive to be those of mastery. This would include, besides doctor, lawyer and Indian chief, the fivefold ministry of apostles, prophets, evangelist, pastors and teachers.