Different races can of course be generally different biologically for things. Blacks are more susceptible to sickle cell anemia than any other race, for example. And cystic fibrosis primarily affects only Northern European whites. It follows that ticklishness, if it is a genetic trait, can absolutely be more prevalent in certain ethnicities over others, just like skin color and facial features are. There's nothing "wrong" whatsoever with someone saying "in my experience, blonde Swedes are the most ticklish, and Middle Eastern women the least!" We're just talking about personal experiences here. And this is an anonymous site!
I think it's probably something more like a percentage of each race. For example, like 15% of one race, 30% of another, 40% of another, etc. And the most interesting fact to me would be which ethnicity has the highest percentage of extremely ticklish women. I have no idea. But it's a fun to guess! Thai? Italian? Australian? Russian?
As someone who's been around the block and tickled MANY women, I'll contribute the following:
The most extremely ticklish woman I've ever encountered was a super cute, athletic, very talkative 100% Irish-American brunette. 2nd was a short and feisty Mexican-American.
Curious to hear from others. What ethnicity was the most ticklish woman you ever tickled?