should bestfriends beat eachother up and reject their thoughts?

Obviously not. Bestfriends are honest with each other, but do not have to reject anyone's thoughts in the process. Nor beat each other up (?). If someone who claims is your bestfriend does those things to you then they're not really your friend and considering cutting them out of your life wouldn't be a bad thing. No one should allow themselves to be mistreated, no matter who it is.

in any relationship, everyone should respect each other... more so if you are best friends.

For me its sometimes happen. This is because you can't make all people to agree with you. But the problem here is how serious the problem is. If you know the problem you can know how to settle it.. bye

I wouldn't call them best friends if they were beating each other up.