I'm not gonna debate the merits of the ST versus the PT or the portrayal of the characters. Been there, done that; doesn't change anyone's mind. But I can assure you that the fan hate of the PT back then wasn't just about them being poorly made films, and the prevailing sentiment was certainly *not* that those movies worked well with the original trilogy.
I was in my early 20's when the PT started and had grown up a huge OT fan, so I recall the fan reaction to the PT very vividly. Lucas went from untouchable hero icon to the object of merciless ridicule. Fans were (and are, in my case) pissed about how many contradictions existed with the OT. How Kenobi was made into a bigger liar, how Vader was diminished, how Yoda was completely reframed and compromised, how Boba Fett was done wrong, how the Jedi were not what Kenobi described to Luke... I could go on and on.
The People vs. George Lucas got made by dejected OT fans. Red Letter Media became a juggernaut based on hours of YouTube videos ripping the PT, in part because of the way those movies conflicted with the OT and were such a drastic departure from it in so many ways. Late-night talk shows were trashing it. Actors from the PT contemplated suicide as a result of the reaction and treatment they received from fans.
The selective memory in SW discussions for the last few years is incredible. The PT has enjoyed new life because the kids who grew up enjoying it got to watch those characters and plot points get fleshed out more in cartoons. Now those fans are starting to raise kids of their own and introducing them to the PT on their terms. Fair enough, and good for them. But let's not pretend that the PT was largely regarded by longtime fans as a positive extension of the lore. Quite the opposite, in fact.
And Lucas didn't care what the older fans thought. Nor should he have. Nor would he today.