Guest post by "Gillsing" I'm guessing James thought Xade was calling him "a zero" with the "Loved the zeros comment on the one before." Which actually seems to refer to the last panel of page 249, and not at all to the previous comment.
A lot of times it's a good idea to turn the other cheek at perceived insults or attacks, because sometimes they're just mistakes on someone's part, and retaliation just makes things worse. And hey, even if it's an actual verbal attack, it already reflects poorly on the attacker, so as far as I'm concerned, there is really no point in name-calling even as retaliation.