Just a case of cultural appropriation. People right now just love to praise foreign products and distance themselves from local ones - right now, anything that comes out of Japan is "exotic" enough for people to start harping on about how much superior it is. Happens with foreign films as well. I can't help but think that current Korean films are way better than Hollywood pictures, but I realise that this stems from an ignorance of films in general; there are many good Hollywood films I haven't bothered to watch last year, and I'm sure there are plenty of crap Korean films that I haven't seen, simply because only the better films are likely to be exported to the West anyway.
Back to comics vs manga. Sure, manga is ok, ignoring the fact that "manga" is just a Japanese equivelant term for "comic" (likewise the term "anime" is used to refer to Disney cartoons or any animation), but comics are superior simply because of this guy: