Times have certainly changed and today much of what's in older films is seen as politically incorrect and insulting. Often, I think folks make too much out of this, as you cannot censor a film just because of a bit of offensive content. However, in the case of "Maid for a Day", I could certainly understand someone feeling irritated with it....and if their heads exploded while they watched!
The offensive part involves a flashback where you see a stage production. The actors are all white and playing black characters but the REALLY offensive part is the curtain...complete with giant stereotypical black men with watermelons on it! Yep....it is pretty nasty!
So is the short still worth seeing? Well, first, if you cannot look past the offensive start of the film, probably not (and I'd hate to hear about your brain exploding!). And second, well, the short is pretty crappy otherwise. Like many Vitaphone shorts, the plot is scant and it's mostly a review of songs and dance numbers. Some of them are very good (the bizarre cigarette dance was actually very good) and some (the godawful impersonations) were not. Overall, view at your own risk....and if you skip it, you won't be missing much.