What heresies have required (since the Reformation) 'rejection' after the 'first and second admonition' (Titus 3:10)?

>But avoid foolish questions, and genealogies, and contentions, and strivings about the law; for they are unprofitable and vain. **A man that is an heretick after the first and second admonition reject**; Knowing that he that is such is subverted, and sinneth, being condemned of himself. [Titus 3:10 KJV] This is a question for Trinitarian, Protestant, Reformed Baptists. What has been regarded by the Reformers and by subsequent generations of Protestant Trinitarians as the heresies which would warrant the rejection of the heretic after suitably admonishing such a person on two occasions ? After discovering a heresy, one should clearly admonish the person and attempt to instruct them accordingly. However, if they withstand such assistance and repeat their heresy then a second attempt must be made to further face them with the seriousness of their words and the depth of their contradiction to truth. But, thereafter, the apostle requires us to reject such a person as they have been undermined to such an extent that their words are sin and their own conscience is condemning themselves even as they speak. What heresies have, in the past and present, provoked such a response - publicly - by the Reformers and by subsequent generations of Reformed, Protestant, Trinitarian Baptists ?