jack - // In my experience, when you tell men that you and your female companion are 'together' it acts as a cue for them to start asking all sorts of rude, intrusive questions, make lewd suggestions and treat you with complete disrespect.... //
I have discussed this with a gay friend of mine, and she concurs that she has received a similar response when advising men that she is gay and not interested.
Apparently in her experience, I was unique in being the only man she knew who, on being told she was gay, exhibited no lurid curiosity about her sex life, because, as I told her, unlike what appears to be the vast majority of my gender, I am not at all aroused by the notion of two women sharing intimacy together.
I am afraid men always have and continue to - let themselves down in trying to strike up conversations with young ladies they don't know.
I believe they are raised by fathers who give them something along the lines of "You'll never understand women son, I never have …" which leads them to treat women as some alien species, instead of simple individuals like themselves.