Before I was a JW, I had very religious Bible-believing grandparents. In a way, I think they made me a sitting duck for the witness propaganda. It is almost impossible for a group of human beings not to have contentions and strife among themselves. The key is to become the best person you can be and don't worry about the others. Be there for them if you can help them in any way, then go live your life.
It is the duty of every person to accept others as they are, and to be there to help them if they wish to change anything or need a helping hand.
If one church (or anything else) is not to your liking, try another. Then keep trying until you find what you're looking for. I certainly would avoid any church that has a self-righteous, exclusionary philosophy.
There is always the option of not attending any church and developing your own spiritual life.