Situation: Customer displeased with weather.
Talking points: Tell them you are also extremely upset by the weather. Apologize that you do not feel that you can talk about it due to your grief and trauma. Continue the remainder of the transaction in silence.

Situation: Customer has split order, heaped into cart without rhyme or reason.
Talking points: Ring a two-bell and have an empty cart brought up. Give the cart to the customers and tell them they can separate their orders into the two carts. Make sure they understand that you will watch them in silence as they do it.

Situation: Customer fills flower bag with water, leaves in cart without any indication of spill hazard.
Talking points: It’s important to realize that the customer may have had good reasons for putting an open sack of water in the cart without any indicator. Before reacting to the needless spill with anger, try to understand their perspective on the matter. Ask if they have ever had experience with how fluids act in the presence of a gravitational environment. Ask if they understand the purpose and mechanics of language. Let them know that you are sympathetic and that if they grew up blind, unable to speak, on the Moon isolated from all other humans, then you understand their difficulty in acting appropriately. Do not continue the transaction until you have clarity on their specific perspective.

Situation: Customer stops right by another customer, completely blocking aisle.
Talking points: The ideal way to address this situation is to be a Ranger, level 25 or above. Cast a Canyon of Chaos incantation to drive a rift between the customers, making a way for others to pass. If you are a low-level Ranger then consider casting a Whirlwind spell to break them apart enough that they can be pushed aside with the help of other customers. If you are not a spell caster, then build a campfire and rest for the night to restore your life points.