Is there a word for treating a silly topic with an overly serious tone

Facetious is defined as treating a serious topic in a joking manner.

Is there a word for treating a silly topic in an overly serious manner?

For example, "GIF is pronounced with a hard G and this is the hill I choose to die on!" or "Lasagne is the best pasta dish hands down and anyone who says otherwise is dead to me!"

Thanks in advance for any help!