I find trigger warnings to be pretty frustrating at times and a useful idea at others. The most annoying thing about them is when they are overused and when people are overly sensitive. But at the same time knowing that there is something that might be offensive or unpleasant can be nice. For instance when I visit the movies and see previews that list the reasons why a movie is rated R. That is helpful and can let me avoid seeing a film with x if I dislike x. Just my two cents.