Gender equality means that knight_shadow's gender-neutral way of typing to you is appropriate whether you're a woman or a man. All is fair in love and message boards.
knight_shadow, "guy" is typically used to refer to men. "Boys" are referred to as "boys." You (perhaps subconsciously) typed "girl" and "guy" which implies a nonadult female and an adult male. The question that Summerchild asked and her follow-up explanation are exactly right. However, this is a subconscious thing and that's why you'd think she was nitpicking. This isn't the worst thing in the world because "guy" is slang but it's almost as bad (or worse, depending) as referring to a group of males and females as "guys."
Yay! Woohoo!