I once vouched for my (brother, best) friend at a South Asian restaurant. Told them in my language to give what he asked, and I would be responsible. I've never seen a human so happy. Love you my brother. Mike, may you always smile like that.
They are used to white folk with bland palate that think black pepper is too hot. I love Indian, and Thai and make the curries from scratch with high spice level. when I go out and ask for hot/Spicy they doubt me, so my Indian friend vouches for me, then they make it spicy.
I had this problem at an Indian place near me (though I am of carrib descent, not white). I wanted to go light just in case, so I asked for 6 or 7 out of 10. I couldn't taste any spice. I make hotter stuff at home daily. It was frankly an insult.
Oh Carribean, I had a great dish in Windsor, Ontario once and had the 10. It was hot, but not compared to real spice level it should have been...At least I don't think