Tough but somebody has to do it π
I used to be embarrassed when women rushed up to me and told me I was wonderful (especially if I'd played badly), but I've become more comfortable with being a "role model" (especially now that I play better). If I'd seen a band with a female bass player when I first wanted to play, it might just have tipped me over the doubts and discouragement then, rather than waiting through 45 years of sorrow and lost time before starting.
To get back on topic, these days I make a point of letting people know, hoping it will break down the stereotype at least a bit. Yes the resulting conversations can be annoying, but it's worth that if it makes them re-think.