In this Allstate Ad the mayhem guy is pretending to be a teenage girl while driving a car. There are many stereotypes for teenagers and girl drivers portrayed in this ad.
At the beginning, the viewer sees a pink SUV in a parking lot. THe pink SUV is the first example of a stereotype by implying all girls like pink.
Next, the commericial supports the notion that all teenagers and especially girls are distracted drivers. The first time the Mayhem men is shown he has a cellphone in his hand. He then says "My BFF Becky just texts and says she's kissed johnny. Well that's a problem 'cause i like Johnny". All of this dialogue portrays teenage girls as distracted by stupid things.
Then, once the Mayhem man is upset he says "Now I'm emotionally compromised and whoopsies" and hits a parked car. This interaction supports the stereotype that girls become emotional over miniscule events.
The final stereotype the commericial supports is that teenage girls don't care about anyone else's problems. After crashing into the front of a parked car the Mayhem man just continue driving out of the parking lot saying "I'm all OMG Becky's not even hot." The idea that the teenage girl seems not to even realize she's destroyed someone's car supports the notion that teenagers are oblivious to other's problems.
Even though, many may say this commericial is just trying to say "We'll protect you from accidents that are not your fault" it has many undertones that support several different stereotypes about teenage girls.