To me, that's less offensive than the overall intent behind the ad, "juxtaposing technical facts with a variety of" extremely stupid/ditzy-sounding responses. To the extent that it's difficult/impossible to portray a woman sounding ditzy in an ad without coming across as sexist, it deserves that label, but what really gets me is the dripping contempt for all riders that is inherent in the ad.
No, most riders don't know how far the average Metrobus goes between breakdowns (I'm guessing 99.99% of WMATA employees don't know either). And they don't care. They want their train and bus to run on time, without breakdowns or excessive, unpredictable delays. Implicitly sneering at them for failing to appreciate the finer pleasures of rail tamping is catastrophically stupid. Metro's communications people have officially reached comic levels of incompetence.