That guy is an example of a fundamentalist. In fact, by his logic he shouldn't even be on the internet as it exposes him to many other "haram" things on top of music. Of course he'll simply justify it with a deluded and misconstrued reason that he thinks is logical. That said of course, they're still a Muslim - there's no set criteria that you need to meet in order to be considered a Muslim, but think about it this way, Islam and the other religions (particularly the Abrahamic ones, Christianity, Judaism) all provide a way of life, a way of living as a "good" human being.
How does not listening to music make you a better human being? What kind of religion would reward someone who just starves themselves from any form of stimulus, more than someone who has
helped other people and done plenty of what can be considered good deeds but also happens to listen to music and talk to the opposite gender.Also don't waste your time on this guy ^. I'm Muslim myself and if he walked over to me and started telling me to stop listening to my music on my phone, I would tell them to piss off. Of course they wouldn't do that, they're only brave enough to preach on the internet.