More likely ST haters trying desperately to prove such.
There’s no doubt TLJ was a divisive movie, and that enthousiasm for the ST era has dropped considerably in parts of the fanbase because of it. So, there’s no need to prove anything. If there’s less appeal in the ST era, it’s because the powers that be failed to generate it. That’s not the fans’ fault.
It’s not a matter of enthusiasm. If fans were just unenthusiastic they would just not watch the trailer and not bother to press dislike. The dislike ratio is just indicative of petty and pathetic fans trying to prove that “new Star Wars bad, Clone Wars good” as if anyone cares.
Why is it pathetic to express dislike in the direction taken by your favourite franchise? Not being enthousiastic about the future of a property is not considered a good thing by fans of that property in general, and people tend to respond to that sort of thing. If you’re a fan, being indifferent to a new series is considered to be the anti-thesis, of what being a fan is all about, and so in the eyes of those fans it is an extremely negative thing. Your reaction is akin to telling people to just not care, be indifferent, and stop being a fan.