I just happened to find this post by Salman, tackling upon this very question: http://www.sunniforum.com/forum/show...l=1#post271338
salamu `alaykum [1] The "slightly disliked" can be that which is opposite of [a] the confirmed sunna or [b] the mustahab. If it is in opposition to the former, then doing it perpetually is sinful and blameworthy. If it is in opposition to the latter, then it will not be sinful even if done perpetually.