"Oh lord" is eye-rolling in written form, and "a joke" is not far off from "crap". These are the sort of things that "be respectful" and "don't be gratuitously negative" are asking you not to do.

I don't mean to pick on you personally. It's clear that you didn't mean to be rude. But casual disrespect poisons the discourse here and we all need to be careful about not doing that, especially about others' work.