Now that you mention it, the idea that redheads are hot-tempered and irrational (which is itself a vestige of the “Irish temper” myth) does have a certain purchase on this side of the pond (U.S.)… though I mostly think of that as an artifact of mid-20th-century genre fiction, and in that context it mostly seems to apply to women, often coupled with a certain “you’re so cute when you’re angry” dismissiveness.
Now that you mention it, the idea that redheads are hot-tempered and irrational (which is itself a vestige of the “Irish temper” myth) does have a certain purchase on this side of the pond (U.S.)… though I mostly think of that as an artifact of mid-20th-century genre fiction, and in that context it mostly seems to apply to women, often coupled with a certain “you’re so cute when you’re angry” dismissiveness.