I don’t think online forums are a good representation of a denomination or faith. People are anonymously posting and you don’t know who they are… you can’t hear their tone of voice or see their body language etc.
Some people are rude to each other on this forum as well, but this is not a church, it’s an internet forum. Besides that we are all sinners, whether believers or not.
I guess when you go to a Protestant church or a Catholic church, people are coming together to worship and praise God, pray, etc… not to argue and treat each other with disrespect.
If you want to learn about the beliefs of that church you are interested in, I would suggest talking to the pastor there.