Shaykh Muhammad Ibn Salih Al Uthaymeen (Rahimahullah) said:

What is very unfortunate today with many of the youth is that they have taken the scholars to be icons, imitating them, showing allegiance to those who show allegiance to them and showing enmity and hatred to those who show enmity and hatred towards them. This is even the case when the one who shows enmity and hatred towards them has a legitimate right to do so, and those show allegiance to them have no legitimate right to do so. They’ve begun to dispute amongst themselves with statements such as: “what do you say about so and so?” and “What do you say about so and so?”, but why? I would say that so and so is right sometimes and sometimes he’s wrong! If he makes a mistake while he is a mujtahid (i.e. scholar who acts upon his knowledge to arrive at what is consistent with the Book of Allah and the Sunnah of His Messenger), then his mistake is forgiven and if he is correct, then he gets two rewards. However, to show allegiance to those who have an allegiance to him or enmity towards those who show enmity towards him, regardless of what the situation is, this is not permissible! (Reference: http://www.youtube.com/watch?v=b2EnhBBwWHw)