why does it sound like a troll? what garbage. Is that how you explain away everything you are previously unaware of? Of course it happened. Announcements before sports events after the death of someone eminent/related to the sport/victim of tragedy are commonplace.
My opinion of the few who participated in the hissing is one of non interest. Why the outrage that a handful of people out of thousands did something idiotic.
They aren't representative of the majority of supporters there.