Some people believe Star Wars is about lightsabers and Jedi, The Force, X-wings and Imperial ship designs, John Williams music, and notes George Lucas scribbled on napkins decades ago, among other things. But I think really, the Original Trilogy was about resisting against an established tyrannical order- a group of friends who sacrifice for each to fight evil and oppression in the name of freedom. They resist. Loyalty to each other and a good moral compass leads them to defeat evil and save the galaxy and their own familial relationships.
Star Wars is actually about whatever you want to pull from it. There’s no right or wrong answer to the question “what is Star Wars about” unless it’s something that’s not actually present.
I think TLJ, more than any other Star Wars before it, has challenged people’s notion of what Star Wars “should be about.” And for some people the conflict between what they want out of Star Wars and what they got out of TLJ is too much for them.
And then you end up with a user name like “X ruined Star Wars.” :p