In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Al-Allaamah Ubaid Al-Jaabiri [may Allaah preserve him] said: When they [i.e. Ahlus Sunnah] speak against anyone amongst the people, it is not due to his lineage, tallness, shortness or specific traits etc. This does not hold any value in their view. They speak against a Mukhaalif [i.e. the one in opposition to the truth] due to the corruptness of his methodology. They speak against the [deviated] groups and individuals who are in opposition- not because of their personalities; rather due to their deviation from guidance, the true religion, the path of the believers [i.e. the Sahaabah] and the [authentic] Sunnah of the leader of the Messengers [i.e. Muhammad (sallal-laahu-alayhi-wasallam)]
[Source: An Excerpt from ‘It-haaf Ulul Basar Bit-Taleeqaat Alaa Risaalah Al-Amr Bil Ma’roof Wan-Nahyi Anil Munkar’ page 17-18. Slightly paraphrased]