I was apprehensive about going, fearing the bottle-chucking segment of music festivals would show up en masse, but the worst I heard was some guy ribbing his buddy with, "You gonna get an X Japan tattoo now, dude?" The band was well-received where I was standing.
Contrast this to when I saw Dir En Grey at a metal music festival in Wisconsin a few years ago - the sound was utter SHIT and the crowd was very disrespectful. Non-fans booed and ripped on the pockets of fans seated on the lawn. One chick stood up and gave the middle finger through an entire song. (I did get to body-slam her on the way out, so that was rewarding) Holy shit, I felt picked on. Didn't get that feeling at Lolla, but I was buttressed by tons of other X fans around me, too.