The conduct of a true Bahá'í is to be at all times kind and loving, trustworthy and honorable. This is how to behave towards all, even those who are unjust and one's enemies:
Likewise, they must treat with and behave toward all the governments, nations, communities, kings and subjects with the utmost sincerity, trustworthiness, straightforwardness, love and kindness. Even they must make hopeful a bloodthirsty enemy, show sympathy with the utmost faithfulness and honor to the perfidious unjust, know the ill-wisher as the well-wisher and torment not the sinner with reproaches. Should they become the targets of a thousand arrows of persecution, they must challenge it with love and friendship and treat every one with purity of purpose and kindness. Tablets of Abdu'l-Bahá Volume 2, p 436Even though we may fall short of achieving the level of spirituality espoused by the Master, it is clear that those who would call themselves "Bahá'í" must be prepared to demonstrate the utmost goodwill, kindness, mercy and friendship to everyone we meet.
O ye friends of God! Show ye an endeavor that all the nations and communities of the world, even the enemies, put their trust, assurance and hope in you; that if a person falls into errors for a hundred-thousand times he may yet turn his face to you, hopeful that you will forgive his sins; for he must not become hopeless, neither grieved nor despondent. This is the conduct and the manner of the people of Bahá'í This is the foundation of the most high pathway! Ye should conform your conduct and manners with the advices of Abdu'l-Bahá. Tablets of Abdu'l-Bahá Volume 2, p 436
Let us demonstrate by our deeds, in lives of service, who are the true Bahá'ís.