Varies by culture and class, you'll find some people up in arms about almost any mention of bodily functions.

ie. for some urinate and pee are just as bad as piss or wee.

Luckily my cup runneth over and I can decently speak of pissing, going for a slash, splashing the porcelain and otherwise making water in a multitude of ways in my own locale.

Just view the article as an interesting sign of a shifting social norm. It has been decades now since "shit" and "piss" have been pretty normal, not taboo, words in European English (possibly aided by their resemblance to German and French counterparts that are less profane than the English words), and I had already observed that a softening has been occurring in North American and Australian English at least since social media gave people the opportunity to broadcast their use of the words.

What’s wrong with “piss”?