system
Given the following post, respond as if you're commenting on Reddit:
human
Why do some people simply not listen to what other people have to say?

I sell industrial equipment that could kill people if installed improperly. It is my job to know the safety requirements, ratings, etc. Many customers disregard me warning them that what they're trying to do could get someone killed. 

Im not really sure how to explain the "feeling" that these customers convey in the way they don't listen, so I'm including an example. 

A piece of equipment we sell has a little package of bolts inside of a tube, seated in one leg of the equipment. It's standard for me to tell the customer something along the lines of "the bolts are in a little tube in one leg. Make sure you remove them before installation. You can use a little flathead screwdriver to pry them out." I even have a package removed from the leg that I use to show them what to look for.

I had a customer come in today to purchase one of these pieces of equipment. I go through my whole spiel about the bolts, show him what the package looks like, how to remove it. Not two minutes later, he asks me (his actual words): "So where do I get the bolts to put it together?" 

I go through the whole thing again, show him the little package of bolts and explain where they're at and how to get them out. When we're loading the equipment into his truck, he looks down one of legs, sees the bolt package and says:

"What is that?" 
I explained: "Oh, those are the bolts I was talking about." 
Him: "Well how am I supposed to get them out?"

Now, I understand this is a relatively small thing, certainly not going to be a life and death situation, but I find the more and more I talk with someone who does not listen, especially when I'm trying to make things easier for them, the more I find myself getting frustrated. 

I really want to understand what goes on "behind the scenes," so to speak, with someone like this. The way this is conveyed is almost as if it seems like they're thinking to themselves "Why would I try to remember, when I can just have you remember for me?" As if they believe my time is worthless. This seems to happen a LOT with our customers. 

Everyone that works here gets irritated by this kind of thing. Are we reading too much into this? Or is this a thing, and how can I deal with it better?
gpt
Customers usually have their own thoughts going when talking to a vendor and it can be hard to let go of what they think is important at the moment to actively listen to what the vendor is saying.

In that kind of moment body language can help you a lot. Want to make sure they remember? Then incorporate it in your speech somehow.

"Before you install it, you have to make *sure* [pause, make proper eye contact and ensure you have their attention] to take the bolts out of that tube, you will need them to assemble said item"

The pause + eye contact is a good way to get their attention, as they will wonder why you suddenly stop and look at them.