Well, I don't have that kind of problem. I mean the problem of loving the writing and hating the writer or vice versa. That's mainly because I read for the writing and do not really bother about the writer. For all that matters to me, the writer might as well be an eight-limbed green-skinned alien.
Depends what you're reading.
For fiction and such, that's fine. When you get into non-fiction sometimes it makes a major difference. I'm thinking of something like a martial arts book - if I know that the author is a jerk who doesn't know anything about his field I'm not going to like his writing no matter HOW good it is, because I'll know it's all BS.
The opposite side of that of course is if I have a bromance on the writer, I'll accept ANYTHING they write - which, again in the martial arts book field, could get me into a world of pain.
Or, I could like the writer as a person - let's say Kat Yamaguchi wrote a book; I love the guy, but his book could be terrible.
Or I could despise the person - Steven Seagal in his later years comes to mind - yet still respect and enjoy his writings.