This isn't something new. Disney has always had "trouble" with the "boy" crowd, so to speak. It's baked into their DNA as a company in tandem with how Americans socialize their young men. Even more man-friendly subject matter from Disney like Aladdin or Hercules is offputting to a lot of young guys due to being fantasy. Buying Marvel and Star Wars was meant to offset that, and it's clearly wearing off.
I don't know what the solution is, but I think the inevitable framing of "yeah the company SUCKS now" doesn't hit the mark. A lot of younger people I know do have a fondness for Disney, even if it's definitely nowhere near as strong a brand as it is with Gen X and millennials. The thing that Gen Z and Alpha are super passionate about? Anime and video games (both the games themselves and streamers), two things Disney avoids like the plague. And call me a skeptic, but I don't think investing in Fortnite is gonna be enough.
A band-aid fix (keyword, band-aid), parkside, would be a Ghibli ride in Japan at Epcot, and since they let Nintendo slip through their fingers, do something with Kingdom Hearts or Sonic the Hedgehog at Studios and/or DCA. But longer term, they either need to figure out how to shore up what they were good at and made them an American staple (media for little kids, young ladies, single older adults, and families) while not trying to capture "all quadrants", or actually break into the young guy market with something truly original.