Buddhist masters have to be careful in expounding discourse and preaching Buddhism sermons.
Buddhist masters must follow the Teachings of the Buddha that preaches :-
(1) Inclusiveness
(2) Universal Compassion
(3) Peace
(4) Harmony
(5) No killings, no violence, no exclusiveness
Deviating from the above values and teachings - infringe Buddhism and deviate away from Buddha's Teachings.
Deviant teachings, and teachings that advocate exclusiveness, hatred, killings, violence - are non-Buddhists.
Such Buddhist masters do not represent Buddhism.