Obviously be sensible where you read this, and be aware that it's topic is strong language which accordingly features throughout the article.
From the research just 3 terms are identified as the strongest swear words. The BBFC undertake similar regular research to gauge public feelings on which terms should be hit with 12, 15 or 18 ratings - and there seems to be some difference, though that could put down to the OfCom research method (using 4 categories of acceptability linked to the watershed rather than more specific age ratings).
Two of OfCom's 3 strongest terms are featured heavily in Working Title's sci-fi/comedy hybrid World's End, with 'the c word' also multiply used - enough to force an unexpected 18-rating on the Ken Loach indie Sweet Sixteen but judged okay for the studio subsidiary's production to get a 15-rating.
Here's a short comparative analysis of some American audience research, showing quite a different attitude: http://nofilmschool.com/2017/08/swearing-in-movies-harris-poll