The "Lolita" voice in the video must not be the real voice of "Unpleasant Rain"! Anyway, many players had never heard her actual voice, plus she was always mocking people with her chat bubbles, people would rather play along in framing "Unpleasant Rain". Don't forget her extreme wealthiness, nowadays many would hold jealousy against the rich.
Hence, many players would be envious of the fancy, cool equipment of this "Great swordmistress" as she walked towards the Arena. Just because they were all in the safe zone in which the system did not allow any PK-s, many of them who had been beaten up and humiliated by "Unpleasant Rain" would happily tag along to cuss and badmouth her whenever they saw any crowd booing her.
Sitting in front of the screen reading all these chat bubbles, "Yu Shengfan" smirked, "These weaklings are amusing, I wanna play games even more now!", she said to herself with her cute lolita voice.