Because Disney is sure as shit related to the first.
The reasons they may be hated for that don't bear much relationship with copyright infringement which focuses almost exclusively on newly released things that would be copyright regardless of Disney's lobbying.
You are the one attempting to insinuate that only people who use The Pirate Bay object to their perversion of copyright laws and discussion. Multiple alternative reasons to be angry with them have now been presented to you, but you just claim they are unrelated because you assert that the real reason is that they are just interested in pirating recent things. In discarding these alternative reasons because they they don't mesh with your already unsupported assertion, you are begging the question.
People are in fact upset with the MPAA/RIAA for their abuse of terminology and all that it facilitates: the corruption of copyright laws, weaponized lawsuits, and the shackling of (frankly ancient) culture.
Pretend that people are only upset with their abuse of terminology because they want to pirate things all you want, but you are dead wrong.
I don't dispute people are upset with the MPAA/RIAA, just that it has very little to do with Disney or material that shoulda/coulda/woulda been public domain at various times in the last century.
Centuries before Disney was created the copyright length was still decades longer than the age of material people primarily pirate.