Me, too! For a long time I had below the waist length hair. I found out that some people at work thought I was a religious fundy. Apparently, they had never heard me fucking speak. 
I’m very nice but my language tends to be … salty.
Probably assume I have very bad credit . Unfortunately, everything else is usually pretty spot-on.
Depends on what I’m driving that day and get out of. I took the Jeep to the gas station once, and everybody backed slowly away from me.
I haven’t a clue about what people think when they first meet me. It very much depends on the situation where I meet them. I’ve been assumed to be a business executive, a teacher (by my fellow students) and a slut (because someone lied about getting it on with me).
Probably the most common assumption is that I am retired because I have white hair.
People, I’ve discovered, are freaking idiots in general.
I had a co-worker who thought I was Jewish. I didn’t know about it for years. It was a surprise. I went to a high school that was 60% Jewish when I attended, and he knew that, so maybe he assumed? It wasn’t a negative for either him or me, so it never affected our work relationship. We were friends outside of work! His “cousin” even became my best friend. It was just kinda random.
Although my mom did say once that she thought we might have a sliver of Jewish ancestry, it hasn’t shown up in any of the DNA tests I’ve had done.
I sort of get that at some places I went to regularly - I eat tofu, and frequently do the vegetarian option of foods, and would bring vegan stuff to pot lucks. Then we all went to a department holiday party and I got the prime rib - people were amazed because they thought I was vegan. I told them that I just liked vegetables, and wanted to let vegans have some sort of options that were not stuff they brought themselves.
My brother and I have coppery red hair, extraordinarily fair skin with a smattering of freckles, and he has blue eyes while I have hazel eyes that are most often an unusual grayish blue-green. Virtually everyone decides we must be 100% Irish, which we know because people tell us their assumption frequently. We are not all Irish. We’re actually only 3/4ths white to start with…in total only 25% of our ancestors came from the Emerald Isle, so it’s fairly likely that many of the people deciding we’re the epitome of Irish-Americans are far more Irish than we are.
Like others in this thread, I could easily be misidentified as a Trumpy Republican. I am a white male, prone to dressing in the style of what I actually am…a blue collar, manual laboring, high school graduate. I have a full head of hair that I keep buzzed to a very short length and sometimes shaved smooth. I drive a pickup truck.
In fact, I am a conservative Democrat, anti TFG, anti current Republican party, anti facist, pro democracy.
Sadly, even in this day and age, every single person I meet in the office who doesn’t know me seems to assume I’m in IT.
It doesn’t matter what I’m wearing, it doesn’t matter what the meeting is about, they assume the South Asian looking guy is from IT.
Perhaps? But what do they think of the little people?
People are always assuming I’m NOT gay. My husband too. When we’re out in public together, people never make the connection that we’re a couple. And since I’m 20 years older, many people assume I’m his father.
And since I’ve gotten a frown line between my eyes, people assume I’m angry.
People can get a lot of things wrong about anybody.
People have told me that my accent comes from… over twenty different countries. Sure, if you say so!
I get asked for directions a lot too.
Outside of Canada, people sometimes have asked if I was a policeman. I am not. I have lifted weights for years.
My Spanish is pretty good, but my accent is “extranjero”. Brazilian, amirite?
I must make a rotten first impression, because here’s a partial list of things people have been wrong about when they first met me:
I’m gay
I’m Jewish
I’m not funny
I’m not serious
I’m an asshole conservative
I’m an asshole liberal
I don’t like you
I’m an employee of whatever store I happen to be shopping at
I talk too fast to be from around here
I talk too slowly to be from around here
And when I was posting here under the name kunilou more than one poster was convinced I was a woman
You’re kunilou???
I very much look like a butch lesbian with my short hair and jeans and sandals and stuff. And I’m built like a tree. If people don’t think I’m a man (I get called sir a lot) they think I’m gay.
No problem with me tho, I’ve already got a man so I’m not on the market. As The Kids In The Hall said “I wish I was a lesbian. They get so much done in a day.”
Oh yeah, around here, some people think I’m a woman. Last time I looked, I’m not.
I have had several people think I am Jewish. I have a name that could very easily be Jewish and I used to live in the Catskills, an area which has a significant Jewish population.
I have had several people think I am a conservative. I can see that; I have the background. I am a old straight white man, who grew up in a rural community and worked in law enforcement.
I’m an American living in Europe, but I don’t dress American. No matter where I am, people come up and address me in the local language, and are surprised to learn who I am.
Yes they are. Most people tend to assume that I’m nice, which is so far from the truth its not funny. I’m NOT nice and I DON’T want to listen to your life story while trying to tell you that this feed and grain store has never sold cheesecake and probably never will. I’m NOT nice so go the fuck away, dammit!
Oh good one. My husband also gets mistaken for my father.
I’m a generic white fat female blob with a Midwestern accent. People think I am conservative Suzy homemaker who goes off to church every Sunday. Um no. Liberal unmarried atheist.