But don't let the comments offend you to the point you would stop writing. If you like doing it, keep doing it, no matter what people say.
Indeed.
My advice would be listen to what other people think/suggest. You don't have to agree, but at least consider what they are saying. I'm relatively new to the FanFic forum, and I've seen far to many people post a story, and then insult/get angry at the first person to offer them constructive criticism - don't do this.
1. It's not fair on the person who took the time to read what you wrote and think carefully about how you could improve it.
2. It makes you look like an ungrateful prat.
Other than that, enjoy what you write ^_^