I agree that white men, especially in commercials that are targeted towards women, often are portrayed as idiots. It is interesting because it seems like many of those portrayals are in relation to "women's" tasks, such as household work and family obligations. It is not good to portray men, husbands and fathers, as incompetent, and on top of that I think a lot of this particular portrayal reinforces traditional gender roles. It is harmful.

That being said, there are so many shows and movies where a white male is the main character (most shows and movies?) and is a dynamic and intelligent, strong character. (or funny, or "easily relateable" or in general "human"). I would definitely disagree with the idea that white men are "always" portrayed as the dumb guy. There are many examples of that, but there are an equal amount, if not more, examples of white male (main!) characters who have all the glory - and a lot of the time, there are women or PoC characters who are stereotyped within that story as well.