There's nothing more blood boiling than when you go out of your way to do a favor for someone only for them to have the audacity to correct you—even ridicule you—over how it was done. Somehow, a simple thanks isn't enough. Instead, some complex ego jiu-jitsu leads them to feel it necessary to belittle you and your act of service in order to bring themselves back up to being "better than" you in their own minds. Anyone who thinks or acts like this should just do it themselves or pay someone to get it done how they want it.
And, yet, when the miserable grump next door asks you to mow their lawn for them, it's hard to say no. If you've known them for long enough, you're probably privy to the fact that they don't have it easy and feel inclined, maybe even a little pressured, to lend them a hand. Though you might start to question what the heck you were thinking when you start to receive messages like this guy did after he went out of his way to mow his neighbor's lawn.