where I grew up in California not only is “dude” generally non-gender-specific, half of the time it doesn’t even refer to a person at all.
I said it to a faucet today.
Having also grown up in California, I can attest that dude can be anything. Males are dude. Females are dude. My phone is dude. That cat over there, it is dude. The green light that only lasts long enough for 1 car to pass is dude. I have called my hair “dude”. I have called my coffee maker “dude”. The entire population of the world, and all of their belongings, are all dude.
we are all dude
everything is dude