359 and 641, what's going on? How did it escalate to a quarrel at Xue Zhiqian's concert?

While surfing online, I stumbled upon the news that Lao Xue is going to have concerts in London and Sydney [Wow]! Just as I was about to look into it and plan to buy tickets with my girlfriends, I suddenly saw a bunch of discussions about 359, 641, and something about a "Tu Ge", which really puzzled me. Isn't this supposed to be a happy and celebratory event? Why has there suddenly been a tear-up in the comments [Embarrassed]? Can any sisters explain this to me [Laughing till I cry]? The drama is really taking off!