As a Californian, I take GREAT offense at the idea of gendering “dude”.

There is no more gender neutral term than “dude.” You’re dude. I’m dude. He’s dude. She’s dude. They are dudes. The weather is dude. Animals… dudes. Kids: dudes. Elderly: dudes. Girls are dudes. Boys are dudes. Men and women are dudes. Google is dude. Your smart phone… also dude. Parking meter? Dude.

You can use it for anything… but do not gender it.