Do you really mean respectful or do you mean formal?
They are not the same.
I'm definitely looking for respectful. The dojo where I train in Japan tend to be very formal at the beginning and end of practice, and less so in the middle. There is a lot of bowing going on, but it's Japan, so it goes with the local culture. How we interact we each other is fairly informal, but extremely respectful of everyone.
I've been in dojo outside Japan that were formal but managed to be disrespectful of the students. Formal does NOT equal respectful.