You're stretching the concept of "serious" way beyond its normal boundaries. In fact, you've made it so all-inclusive that it's lost its specific meaning.
Consider. The Electric Light Orchestra wanted to be taken seriously for its music. The members considered themselves serious musicians. Not for a moment though did the Dead Boys consider themselves "serious" musicians. The whole concept would have given them a rich laugh. "Heeeeee, heeee, heeee. Yeah, sure, we're serious musicians alright. Buy our records and come to our concerts and you'll see just how serious we are, heeee, heeee, heeee. you got any smokes?"
A case in point was when I shouted out "You suck!" at a Viletones concert, in early 1978 - to which Syd Leckie a.k.a. **** Dog responded "Oh, you know how much you're just feeding my ego by telling me that?" Consider what would happen if I shouted out the same thing just as clearly at an Electric Light Orchestra concert. Their rent-a-thugs would be all over me.