Then you missed the point of the article - she was upset when she realised that they had to convert toilets as there were so few women. Her upset was about the lack of women at the event, not at the toilet arrangements.
It could have been more clearly explained, and closer to the start of the article, but if you read the rest of the article you would have seen this.
Women (and other humans) are allowed to be angry about both perceived and actual injustice. TFA isn't even an actual emotional outburst. It's a reasoned account of something happened to the author.
Sometimes inappropriate tone can turn people off of a discussion. That's one of the perks of reading; if you don't care to be shouted at, you can stop reading. Presenting what you think in a way that makes people want to keep reading is important, and failing to do that lost her a reader.
Sometimes. But sometimes it's used as an excuse to not listen to someone. Sometimes no-matter how valid someone's point is, some people always find and excuse to derail the conversation (look at that long list). So not matter what you do, you always lose. Sometimes one gets tired of that.
It could have been more clearly explained, and closer to the start of the article, but if you read the rest of the article you would have seen this.