I can explain it by pointing out remarks made to which he is
responding:

"Me thinks you are being a bit anal."

"Is it really worth it to you? You sound like kind of an asshole."

"I'm beyond curious why this bothers you, but whatever."

"a) tell the neighbor to put up a duplicate fence, which is going to
make you
look like an absolute ass,"

"or b) ask the neigbor to pay you for half of the fence segment, which
is
going to make you look like an absolute ass,"

"Lighten up, guy"

-- these uncalled-for "straightforward replies" all warrant their
respective replies. Tit for tat, and the original poster didn't supply
the tit.