Find out about the other person and ask them questions. After all, you are interested in what they do and what they can do to help you . Also, you will find out how you can be of help to them, which would make future contact much simpler. Furthermore, the less you talk the less likely you are to trip over your tongue. So listen closely and make mental notes.
People can talk forever about what they disagree about.
That time could be put to much better use by exchanging useful information and building a rapport. You simply want to avoid them. The less you see and talk to them, the better. That is not good if you are building a network. Do not argue.