I get this a lot.
At almost 6’8", apparently that’s really tall to quite a few folks.
I’m 60, short, a little overweight, and balding. Pretty invisible. But every day I get comments about my car. My wife thinks its hysterical, since I generally don’t engage in conversation unless necessary, especially with strangers.
As the OP, I can confirm that this is absolutely in the spirit of the OP. And it’s pretty cool, too. Identical triplets all together is not something you see every day.
As I mentioned in the OP, I get asked about my ethnicity very frequently, and I don’t consider it boorish–I really don’t mind at all. I took Mallard’s comment to refer to when people make comments about a person looking like a terrorist or something.
I guess the only thing I can think of is, “you must be Italian”. And I am. I’ve also been asked if I’m Native American, which I’m not.
If I’m with my sisters, we always get comments like - I can tell you’re sisters. Which flabbergasts all four of us. We don’t think we look alike at all.
Although I now live in Florida, I still keep my old west codger image. A guy approached me on the street one day and engaged in conversation. He got around to asking where I was from and I told him New Mexico. “I thought so”, he said, “You’re just like how I imagined someone from the far west would look.”
Gee, and I wasn’t even wearing my cowboy hat with the porcupine quill band.
Since 1982, and a few times a year since, someone will comment on my “radio” or “FM” voice. Based on that I even had a question in the Dope several years ago asking about how one auditions for radio. Then I got a job opportunity I couldn’t refuse and the whole thing became moot, though I still get the comments.
When my mother and sister and I were together someone would always comment how much we looked alike. The thing is, both my sister and I were adopted from different families and 10 years apart. But we’d just smile and nod…
Now when my sister and I are together she occasionally gets taken for my mother - “she looks just like you!”. Irritates my sister no end 
Not me, but my dog, a black lab. A lady came up to me at the dog park and asked if he was my dog. She then said he’s holding his tail at a downward angle and that means blahblahblah. I just said “uh huh” and she spread her crazy somewhere else.
Not unless my age comes up. I’m a 5’3 female with a baby face, and it’s been decades since I’ve met anyone who wasn’t surprised to learn how old I am (in my early 30s there was a bartender who guessed correctly, which impressed the hell out of the other bartender who had just carded me). Even casual friends who previously learned my age will sometimes forget, because people tend to believe their eyes.
(I had bariatric surgery a few months ago and currently have a bit of a turkey neck thing going on, which I think ages me, but apparently the overall weight loss makes me look even younger.)
My last name is very unusual and lends itself easily to a particular rhyming response (nothing discriminatory or insulting), and I’m always a little annoyed when anyone over the age of 12 feels the need to take the bait. It happens more often than I would have thought. It also significantly affects my first impression of that person.
This is the one I still get. It’s mainly the haircut. Sometimes, if I’m wearing a flight jacket, it’s “Are you a pilot?”. One time I was in line for an airliner flight to Florida, and the security guy asked if I was an astronaut. But I think he was pulling my leg.
You nailed it! Long, straight skinny skis. 203’s and 207’s. But both pair are rare and unique. Got them both from an ex-racer. One pair are factory prototypes (never seen another pair in my life) and the other are Limited Edition not available to the public Bitchen’ Ass reproductions of World Cup skis from the 50’s. Real Wood veneer tops and absolutly beautiful. They work great, too.
authier vampires - Bing images
And I refuse to upgrade my Salomon SX-91 Equipes from the early 80’s.
And I am here to tell y’all - upgrading anything in Gato’s gear isn’t likely to improve anything. He shreds the bumps on those toothpicks like nobody’s business! 
“What kind of dog do you have?” (My face mask has dog bones on it, but I’ve always had cats.)
“What are you mad about?” (My resting face has a couple of frown lines.)
“Is that an Apple Watch?” (Yes.)
“What time is it?” Even if I’m not wearing a watch.
If they hear me speak, “Where are you from?” I had 30% hearing loss as a child which was discovered only when I was 3 and was in daycare. I spent 6 years in speech therapy and have been told that I talk like someone who has serious hearing loss. Or that I sound like someone from New York (when I lived in PNW), or someone from London (when I lived in New Jersey).
We are just back from the Caribbean. After a delicious middle eastern meal at a family run restaurant called Little Jerusalem, the patriarch, Abraham, came to our table to chat.
He looked at my gf and said something along the lines of she must really like trying new things. Then he looked at me and said, “then there’s the Jew here, he’s had all this before”.
I was shocked. My gf told Abraham that my mom was Jewish and he said, “of course”.
It was a first. Usually it’s observations/questions about my piercings and tattoos.
HAH!!!
I get that all the time. I have a Rolex tattooed on my left wrist. The time is 4:20. People either get it or they don’t.
“Good God, Man! Was anyone else injured in the accident!”
Google translate says “haberdashery”.
Yes, I looked up “Kurzwaren” on several dictionary sites, and they all told me that “haberdashery” is the British English translation while “petty wares” is the American. But you can’t always trust those sites.
My point was that I even didn’t know what “Kurzwaren” are, though German is my native language.
I have red hair. In addition to endless comments about red hair since before I was old enough to talk back, over the years several people have confidentially declared I’m “clearly 100% Irish.” Which is very wrong. One of my parents was 0% Irish and the other 1/2 Irish and 1/2 Portuguese.