@Joie8 Accidents happen. If you're aware of causing damage at the time it happens, you should report it to the host, and it's also advisable to take pictures showing the condition of the damaged item at the time you checked out.
If you believe the claim was excessive, you may choose to decline it and either submit a counter offer or escalate the case to Airbnb. If you opt to escalate, a case manager will require documentation from the host and make the final decision on the claim.