It's quite radical old-school feminism, a style I myself consider no longer deem called for that often, but it is feminism and I therefore would consider it a women's right issue.

Being offended by crude jokes(or finding crude jokes "wrong") is feminism? How so?

I think unwanted sexualization is a recurring theme in feminism and in Adria's perception this was an instance of that.

Most people wouldn't and hence it's reserved for more radical feminists, but it's definitely done under the banner of feminism and thus I'd consider it part of it.