Everyone has their sympathies and antipathies, and sometimes there are no reasons for the latter. Or there are reasons, but they are incredibly absurd.
Once in my childhood I had a dream in which my mother went to Leonid Agutin. He seduced her with his guitar and the magical "Hop Hey Lala Lee." I remember that in my dream my dad was so worried that I just poured in tears, begging my mom to come back. When I woke up, I found a pillow filled with tears.
Since then I hate Agustin, even though I know he has nothing to do with it at all.