Usually when people call something gay they don't meen literally gay as homosexual. With power metal I think people actually mean gay
. You have a bunch of guys dressed in tight leather pants singing saprono and falsetto about things say related to kids movies or whatever. You have guitarists that have cliche 80's style sweep picking left and right. Singing is not just a women expression but higher pitched singing is usually known to be done by the female sex. Their is something gay about power metal because it resembles 80's glam/hairmetal bands when it comes to vocals and instrumentation.
I do take music seriously nor do I think it should be funny or have a lot of humor. I think music should resemble how life really is/realities earth and surroundings.
just my opinion