In all things you do, it is important to act how you want to be perceived.
If you're happy for the world to see you in all your rawness, then you need to accept that others will see this and judge your character accordingly. We all do may do this occasionally, but it's consistent poor behaviour that is judged often.
And so it goes with business.
Only make promises you can keep, or created actions you know will be viewed positively if you want to remain in business and keep your clients coming in the door.
Life happens. We all know that. But think carefully before you slam the phone down, write that email, get that loud tattoo, or make those excuses. Eventually people get tired of the behaviour and leave.