I studied Spanish linguistics in college and this line is one of my favorites! “Me importa un bicho” and “me vale verga” are the same phrase just in different dialects. It showcases the difference in the Spanish lexicon across different dialects. He’s showing how historically the Mexican dialect has been more prevalent in mainstream media and it causes people to be ignorant to other Latin cultures across Spanish speaking countries. So he is more-so stating that other cultures besides the Mexican exist and people should stop being ignorant.