Red Neck Hick.
I've got a strong "broad Australian" accent, think Paul Hogan, and I come from what's class a rural area, never mind it's a major shipping port, anything outside of Melbourne or Sydney is the back of the moon to most people, so of course you're not smart, you're a dude racist hick who must vote One Nation.
You can't possibly be a social progressive with a strong passion for technology, no all they hear is the accent and assume you're a hick.
Oh another one is the gun owner stereotype, that pisses me off, they think because I own firearms I must be a power mad psycho just waiting to shoot people. Funny thing is I'm actually one of the most pro-gun control people you'd ever meet, I grew up using them, I know what they can do to animals, so I can easily imagine what they can do to people, and I know how easy it would be for some poor untrained person to hurt themselves with a firearm. So I'm a very strong proponent of training and regulation.
Funny story, I was pretty sick last year, bad bad infection in my leg, so I was getting twice daily injections at the hospital, after a few days they got sick of me hanging around waiting for my shots, so they offered to do home visits for me, I thought great, saves me the trip and the wait. So the dude was asking all these questions, where do you live, etc.
Then he comes to what he called "standard safety questions", stuff like "do you have any large dogs?" etc. Passing it off as standard government BS, which it was, until he comes to "are there any guns in the house" and of course I answered honestly "yep", that's all I said, and he just spun and looked at me like I'd made a joke about his mother... He just stared until I said "they're all secured in a gun safe, as per the law of course", he looked like he didn't know what to say. It was amusing and annoying at the same time, all my firearms are legal, they are all secured, with the ammo and bolts stored separately, there is zero chance of someone getting to them accidentally or without me knowing about it, they are all registered, so what's the big deal, it's the people that try and hide their guns you've got to worry about.
Also like the OP, I'm sick to death of everyone assuming that because I go to church I'm a dick, I'm actually very liberal, with a personal opinion that if everyone is over 18 and consenting go your hardest. I don't like the bible thumping "holier then tho" asshats anymore then you do, so stop lumping me in with them kthx.