A vaishnava forgives the offender before the offense is over.
The quality of a Vaishnava is to be humble, at the same time determined.
We have a burning propensity to give love and to be loved. A Vaishnava’s role is to represent and access Krishna’s Affection.
A devotee seeing other devotees getting blessed, seeing other devotees being empowered, seeing other devotees joyful, that should be our happiness. That is a Vaishnava, that is the standard of Vaishnava.
The symptom of a Vaishnava is trinad api sunicena taror api sahisnuna, that's the perfect definition of a Vaishnava. Another consideration is that a Vaishnava is a surrendered soul to Krishna.
When a touchstone touches iron, it turns the iron to gold. Parvata Muni called Narada Muni a touchstone because by his touch the hunter, who was the lowest among men, became an elevated and perfect Vaisnava. Srila Bhaktivinoda Thakura said that the position of a Vaisnava can be tested by seeing how good a touchstone he is, that is, by seeing how many Vaisnavas he has made during his life. A Vaisnava should be a touchstone so that he can convert others to Vaisnavism by his preaching, even though people may be fallen like the hunter.