The only way to challenge this is for you to tweet something to Disney that they then use in their marketing material. That allows you to send them a cease and desist, because you didn't give them permission to use your tweet in that way. At that point Disney is just going to say "ok", shitlist you, and stop using your tweet, because that's cheaper than any alternative.
This is just overreaching bullshit CYA legalese that's never going to get challenged in court.
This is what unfettered and auto-extending copyright enables.
How do you figure?
"You retain your rights to any Content you submit, post or display on or through the Services. What’s yours is yours — you own your Content (and your incorporated audio, photos and videos are considered part of the Content)."
(Twitter certainly isn't unique here, this is the gold standard for user-submitted content. Users always own their content, but grant the service an unlimited royalty-free transferable license to copy, process, display and "perform" the content.)