Why do so many metalheads hate Amon Amarth?

Whenever I join a metal group online or whatever trying to meet new metal friends, they always say how bad Amon Amarth are when I ask if they like them. Amon Amarth has been my favorite band since 2006 and it's hard trying to find other Amon Amarth fans. They make amazing music and their vocals are easy to understand. Plus, they're fun as hell live. I've seen them 5 times in concert.