Drama isn't necessarily bad, but if it is annoying/trolling/harassing/etc. the argument "Good artist can say what they want/ I support them, because I love their art" is not valid. After all creating woderful work doesn't make you a perfect being or give you the right to do whatever you want.
art should be measured equally despite the personality of the artist. if the behaior is really bad he/she should be band from dA which eliminates the need for this question. if not, consider the art and not the artist.
No. I feel the same way with musicians. I might think they are terrible people but I still appreciate their music (this mostly occurs with rappers and rock bands, lol).
Anyway, I've actually run into this situation where someone had a long standing grudge against me. I really didn't care about our little problem from the past and decided to comment on her artwork because I liked it... She still hated my guts apparently. After THAT I stopped commenting, not because I didn't like her, but out of respect for her not wanting to read my comments.