I thought they was saying there's a jarring disconnect between bragging about your writing ability in a sloppily-edited essay. I don't think it's hard to understand their point, is it? I think you were being gratuitously pedantic.

"Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize."

Well, there is Muphry's law.[0] Which I notice you - but hopefully not I :-) - have here fallen afoul of. Although you wrote in defence of bad proofreading; maybe there's another law for that.

[0] https://en.wikipedia.org/wiki/Muphry%27s_law