My opinion is NEVER do it on the internet. Go to a local bar and strike up conversations. Be respectful and do your best to LISTEN to what the other person is saying. I’ve gained an incredible amount of knowledge of how people live and some of the struggles that they come across in their lives that I would have never even thought of. On the flip side, once you show that respect and prove that you are truly trying to learn, you can share your opinion without being immediately labeled as a racist which will 100% happen with an online discussion.