having no thought to your belief to me sounds like they do not know about my belief therefore i would show them the ropes with respect.
If they are disrespectful and loud then at times I feel I have to make an extra effort to get to the same wavelength as them so they can hear me. When I know they hear me then I can tone it back down to a comfortable wavelength of respect. Other times when I cannot tone it down to a comfortable wavelength then let them know they are right and I am wrong then bow out of the conversation.
If they are trying to knock some sense into me then I would listen more to the person who is being respectful. I think that's a universal thing in all of us.
I recently spoke to an atheist and offered him completely equal respect for each other regardless of our personal beliefs and he refused. He said he cannot respect a person who thinks the other person is going to hell. I told him I didn't like the ring of rotting in my grave so let me believe in my fairy tales and he can believe in the truth. He still refused to give equal respect. :(