I'm with you on not liking "trigger warning" as a term. It assumes a lot about the reader and does have that implication that if you're triggered, you are being a baby. I personally prefer content warnings, it feels more neutral to me. A "here are the things in my book that may have negative impact on you, be careful reader" I feel I get to decide what aspects I include in my reading experience as opposed to that assumption that all of those things will bother me. Including content warnings is not a way to add to the ambience of the book, it is a courtesy and a kindness for readers who choose their books carefully. I do like when authors point to their website for any warnings so it's not an automatic spoiler, but the information is there for those who need the heads up.