1. I listen to plenty of both, and try to give each genre of music the time it deserves, avoiding every ignorant stereotype about it. Not the crap you hear on the radio today, but actually well-done pop music that was made in the past, or is made in our days, but thankfully unknown to the majority.
My favourite pop musicians are The Beatles, Peter Gabriel and Kate Bush.
2. Knowing that Heavy Metal is one of the most diverse genres of music, I guess nothing. I mean, come on, meeting electronic and folk elements in metal is not a big surprise, which speaks well about the diversity of the genre as a whole.
3. Metal _used to_ be an anti pop position, but with the 'help' of 90's Metallica and modern rock/nu-metal it isn't anymore.
On a brighter side, leaking some metal into the mainstream awards the metal musicians with more listeners and perhaps even followers.
I don't mind metal being a part of popular music, it does not bother me in any way.