Look it up.
Carmen is opéra comique, a sub-genre that can have dramatic/tragic topic (don't be fooled by the word comique, it's not necessarily comic) but also spoken dialogue.
You also should get informed about the definition of what constitutes a musical. Carmen has operatic singing, unlike musicals.
As for your comment being just an attempt to put down Carmen, the rest of the musical world disagrees with you (including, the composer of the first opera you've quoted).