We better be not judgmental.

[Odessa Dawn]

We better be not judgmental.

I want to say that it’s not good (for us?) to judge other people.

 

[Tarheel]

Say:

We better not be judgmental.

Or:

It's better not to be judgmental.

 

[Rover_KE]

In BE, we prefer We'd better not be judgmental.

 

[GoesStation]

In BE, we prefer We'd better not be judgmental.

We prefer the same in careful American English.

 

[andrewg927]

It's acceptable to use "better" like that in an informal conversation but I prefer "had better" in writing.

 

[Tdol]

I'd only use would or had. In conversation, the 'd might not be audible, but it would be there in my mind.