There are a few people here (Janszoon, Jackhammer, Bob, Goofle etc) who could make that claim, but I think in the main it's too easy. There are bound to be genres you don't like --- personally, it's hiphop/rap, jazz, punk, black metal and quite a few others, though I do like many different genres of music --- and to say you like "all" music (unless you're like those above and a few others here who genuinely can make that boast) is I think an indication you don't have a clue what sort of music is out there, the depth and breadth and diversity of it.
So you like "all" music do you? Including Mexican death-jazz rap carnival punk folk? What'ya mean, what's that? Case proven.
