To be fair, Bloomberg and De Blasio held a lot of press conferences which is fine for people over 40 years old. The secret sauce of Mamdani is creating viral content on social media that hits well with people under 40 years old. Did you see the YouTube video[1] where he was a phone operator for 311? It is so raw and funny. It hard not to be enthusiastic about a mayor (leader) like that.

[1] https://www.youtube.com/watch?v=p1vbAdFkVvA