I've found it much harder for people to trust me in areas where I am highly educated and have experience. I'm a molecular biologist, but if I offer friends (not in science) who want advice relating to biological matters, I've very frequently been ignored by males, even if I mention the studies upon which the information I provide is based. This really hit home after I went through an entire PhD program, only to realize that this tendency to be discounted was unaffected.
I'm part of a new (affiliate) group forming in VT of the Association for Women in Science (AWIS) that hopes to become a chapter (@AWIS_Vermont). The kind of discounting I've described is really discouraging; AWIS serves to push on the other end of that spectrum (encouraging!). I'm really proud that this group is starting to develop in my community!