I wouldn't tell a gay man venting about his issues to talk to other gay men when venting. I wouldn't tell a person of colour to speak to other persons of colour. I wouldn't tell a woman to talk to other women. I'd listen to them even if I didn't personally get their struggle. I'd sympathise.
Sometimes there are great things to gain from talking to people who share your experience. And i'd even advice it myself, and it's been crucial for me. But I would NEVER turn a friend in need away. I'd try to listen to what is being said, sometimed you don't need the answer, just the ear.