Ok. Here's a secret that very few seem to get--that's why I'm calling it a secret: you can have a reasonably satisfying relationship--at the very least--by simply turning your spotlight (attention, consciousness) on finding similarities rather than differences. This is what I call rapport. Rapport is magical. When rapport is established, trust starts to grow. Ultimately, good relating are built on a foundation of trust and respect. So looking for similarities/commonalities leads to the two basic truths of rapport:

1. When I think you like me, I tend to like you;
2. When I think you are like me, I tend to like you.

So liking is key to building rapport and rapport is key to good communication and relationship.

SO try it out. Think of someone you don't really like and/or have some tension/conflict with.
Make a list of all the things you have in common--especially values because common values have you feel that you are from the same "tribe"--but also hobbies, goals, qualities, etc. The more you add to the list of similarities/commonalities, the more connected you will feel--at the very least, it will give you negotiation leverage!

Just a thought.