People (including me) are (at times) unusual and misbehaved.
Why should I be tolerant?
Well, it makes life more comfortable, for one thing.
Why is this justifiable?
Well, we're all here because we're not all there. If we were naturally serene, pleasant, well-adjusted, and functional, we wouldn't need recovery. Some people in recovery are these things, but they need to maintain that status: it won't happen by itself. Everyone else is on a journey. So, if I recognise I'm on a journey, I have to recognise that they are too.
With the programme, I accept everything lock, stock, and barrel.
With other people in AA: if what they say helps, I use it. If it does not, I ignore it.