Ok, so that was horrifying that they treated it so lightly, but this headline seems slightly inaccurate.
It seems they were not blowing it up for a 'gender reveal', but instead were blowing it up otherwise and something in the building produced blue smoke, and they found the resemblence hilarious.
I think directly in front of me in person I've maybe done 150.
Always hate those because the smaller ones you can have a conversation, but when it's over 50 or so, either no one wants to speak up and comment or question, or like one guy wants to and just generally derails things.
Because of that last one, event organizers frequently tell the speakers to not take questions and comments live even if they wanted to try... Which results in blathering on pointlessly live to an audience that sits in silence except for generic audience responses like a little applause or laughter or whatever. When I give such a speech I'm just thinking the whole time "this could have just been a video, where they could seek and watch me at 1.5x or whatever they want to do"