Another chance to start over
Every day that you begin with a colleague, a partner, a customer... it might was well be a fresh start.
There's little upside in two strikes, a grudge, probation. When we give people the benefit of the doubt, we have a chance to engage with their best selves.
If someone can't earn that fresh start, by all means, make the choice not to work with them again. Ask your customer to move on, recommend someone who might serve them better.
But for everyone else, today is another chance to be great.