<human>: My husband and I have a generally good relationship - he's wonderful in almost every way that counts.  I'll ask you to take my word for that rather than making me justify why despite what follows, I still think he's a good guy.

My one complaint is that he has a serious lack of patience when it comes to the day-to-day inconveniences in life.  

I'm driving and make a wrong turn?  That's a loud sigh and an eye roll.

I need to stop and root through my purse for 30 seconds because my keys have gotten lost in the depths?  I get a mini-lecture about how I should always put them in one of the little pockets every time.

The restaurant we're going to is closed when we expected it to be open?  He can't just say "oh, well, bummer" and pick another place.  There's a rant about how stupid and idiotic the restaurant is for not being open for Sunday lunch.

And there are a lot of little things like that in life.  It really gets to me.  He huffs and he puffs and I feel like he's going to blow my house down.  Death by paper cut.  I find myself dreading letting him know if I've made a little mistake or if something hasn't gone according to plan.  And...I hate to put this into words but...it's making me love him less.  :(

On the bright side, he's fundamentally sweet and I feel like he'd be willing to try to work on this if I told him I needed him to do that to be happier in this marriage.

But my questions are:  is it even possible for him to change something like that?  It seems pretty deeply ingrained. Can someone learn to go with the flow and not be impatient when little things go wrong, when this has been their natural pattern for 40 years?  Will trying to change just be an exercise in futility that leaves us both frustrated?  

Should I just try to somehow learn to not let this get to me?  If so, any tips on how to do that?

Give me the gist of the text in a nutshell
<bot>: Husband is Mr. Cranky Pants at every little thing that goes awry.  Is that a changeable thing or should I just try to adapt and tune it out?