No, he's right. Just because you declare an entire sub-genre of metal sucks because you don't clearly don't like it, it doesn't mean you're right about it.
Yes, I'm aware. I'm just fucking around.
Although, TASTE in music is subjective. Some music is objectively bad, and I'm sure you would agree. Just because you may like certain music doesn't mean it's not worse than other music. I'm not really referring to power metal or anything specifically. Nor am I saying everything I listen to is good.