Loyalty is devotion or faithfulness to someone or something, all the strawhats are willing to die for Luffy so no Zoro is no more loyal than any of the others. But yes as the saying goes "never meet your idols" and Zoro wouldn't want to hang around mouth breathers who scream Condom Luffy and ZKK all the time, but then again no normal person would either.
I love how people take Zoro's main characteristics and say other people can do it just as well, yet when they talk about other strawhats, no, they are the best and nobody can compare.
Zoro is the first mate, second hand to luffy, best fighter and most loyal.
What do Zoro haters do?
"Sanji is just as strong as Zoro"
"Nami, Jinbei and Sanji can also be vice captain / right hand man"
"Every straw hat is just as loyal as Zoro"
"Every straw hat would sacrifice their lives for Luffy just like Zoro did in Thriller Bark against Kuma and in the Rooftop against Kaido's and Big Mom's Hakai"
Guess what? Oda shows Zoro doing these things for a reason