Do all stereotypes carry some truth?

To continue an argument on another thread.

I think, for the most part, stereotypes are developed as an excuse to belittle, or look down on, another group of people

Some stereotypes about women that I don’t think have a nugget of truth in them are:

Women are worse drivers than men.
Well, the fact is, men pay more for car insurance because they tend to drive faster and take greater risks than women. Men and women get into about the same amount of accidents, but women are usually involved most often in minor accidents, and men are more often involved in high speed accidents.

Men are smarter than women.
Pfffft.

Women are not as frugal with money as men are. They just spend, spend, spend on frivolous things.
I agree that most women will buy more accessories and be more concerned about their appearance than men (see Beauty Products) but historically it’s the woman who stretch the budget. Historically it’s women who stretch the food.
Also, men tend to buy more expensive things in order to increase their stature. High end sports cars, boats, whatever.

So what sterotypes out there do have a nugget of truth in them?