Why does anyone ever say "forward slash" instead of "slash"? That's the default type of slash! Anyone that assumes backslash is meant is wrong, and they're being enabled by people who say "forward slash".
Part of this frustration comes from hearing too many people read off URLs in entirely too long ways. It's one thing for them to unnecessarily start with the protocol in the URL, but then "forward slash forward slash" is the double whammy that kills me.