It’s completely possible to love or really like a person and dislike their writing. It’s challenging when it happens in writing groups, doesn’t matter so much when you read a great interview with an author and it turns out you can’t stand their novel.
But what about the reverse? Can you find someone incredibly annoying or morally repugnant but still love their fiction? My Mom couldn’t watch a Woody Allen movie after his relationship with his step-daughter went public. She just couldn’t laugh at him any more. Does a bad opinion of someone forever taint what they write?