Perhaps he sees fan fiction as a form of unauthorized use of his intellectual property. He has put a great deal of time and effort into creating his works, and fan fiction might seem like an encroachment on that without his permission. He may also worry that it could cause confusion among readers about what is 'canon' and what is fan - created.
It could also be related to his creative control. JRR Martin likes to have full control over the development of his stories. Fan fiction, by its nature, is created by a multitude of different people with different ideas. This divergence from his sole creative authority might be something he dislikes. He might feel that only he should be able to decide how the story progresses, the fates of the characters, and the overall themes of his works.
One possible reason could be that he wants to preserve the integrity of his original vision. Fan fiction often takes the characters and settings in directions that he may not have intended, which could potentially distort the essence of his carefully crafted world.
Well, for fans, it might limit their creative expression within the world he created. They can't freely explore alternative storylines or character arcs without fearing his disapproval. For the fan community, it could create a bit of a divide. Some might respect his stance and refrain from fan fiction, while others might feel restricted.
It could be that George R.R. Martin sees fan fiction as infringing on his intellectual property or diluting the authenticity of his original creations. He might also worry that it could confuse or mislead fans about the true nature of his fictional world.
George R.R. Martin could hate fan fiction because he believes it interferes with the integrity of his literary world. Another reason could be that it might lead to confusion among readers about what's officially part of the story.
George Martin has a somewhat complex view on fan fiction. He generally seems to be more open - minded compared to some authors. He likely sees it as a form of flattery in a way, that his works are so loved that fans want to create their own stories within the world he has built.
He may defend it because it's a creative outlet for fans. They can expand on the worlds and characters he's been a part of.
One common theme is relationships. Fans often explore the romantic relationships between characters more deeply. Another is the growth of Doc Martin as a person, like how he becomes more in touch with his emotions.
Maybe it's because the quality varies a lot and some are poorly written.
You can try fan fiction websites like Archive of Our Own (AO3). It has a large collection of fan fictions from various fandoms, and there's a good chance you'll find some Martin Clunes fan fiction there. Just use the search function and type in his name.
There are also some social media groups dedicated to George Martin's works where fans might share their own fan fictions. For example, on Facebook, there could be groups where fans post their creative works. Reddit also has subreddits related to George Martin's series, and some of these subreddits may allow or even encourage the sharing of fan fictions. However, one should always be cautious when exploring these sources as the quality and legality of the fan fictions can vary.
George R. Martin has a somewhat complex relationship with fan fiction. Fan fiction in his 'A Song of Ice and Fire' universe exists in large quantities. While he may not directly oversee or control all of it, he is aware of it. Some fan fiction can be seen as a testament to the popularity and rich world - building of his books, as fans are so inspired that they create their own stories within the setting.