Seems a bit out of character for Goofy to be so rude to his customers (unless he really was a jerk in the early shorts), but this was a hilarious short nonetheless.
Just think of it as Goofy the actor playing a character named Goofy, if you know what I mean (similar to how Kermit plays Kermit in most of the Muppet movies).
Besides, a lot of the old shorts placed the characters into different kinds of roles, as well as recieving slight personality adjustments to suit whatever roles they were playing. And they didn't always play protagonistic roles or "100% in character" roles in the early shorts either (for example: in 1933's "Ye Olden Days", Goofy played a somewhat antagonistic role as a suitor to Princess Minnie; or 1928's "The Barn Dance" where Mickey did not win out in the end; etc.).
So, it seems to me that they're trying to restore the original levels of versatility that Mickey and company had in the past that kind of became lost in recent years, even if it might mean slightly altering their personalities just for the roles that they get cast in.