That is in the Simpson's store (Quiky Mart). And that's not an actual Duffy bear. Some of you might not remember that the Simpson's ride also makes fun of Universal in both the Queue videos and also in the ride itself. There is also a joke about Seaworld. It shares its irreverence between all 3 themeparks in Orlando (Disney, Universal, and Seaworld). It's all in keeping with the Simpson's theme.
I do think Disney took one giant potshot at Universal Studios with the naming of Hollywood Studios. You have no idea how much confusion there is for many tourists. Many were already confused with MGM. We already have Universal
Studios that also has a Universal Studios Hollywood. Now you throw in Hollywood Studios into the mix and many guests are confused when purchasing tickets for Universal Studios or thinking their Disney ticket works at Universal. I also know that Disney gets the same problem with guests going to Hollywood Studios with their Universal tickets. I know they had to change the name but did it have to be so close to Universal Studio's name? But that's OK, since they now have Rip Ride Rock-It which sounds similar to Rock N Rollercoaster.

And let's not even get into Disney buying Marvel rights.
That's in the Horror Make-up Show and they also make many wisecracks about Universal also.