Umm, if you’re not getting an “uncanny valley” vibe from the response, you should probably make a working assumption it’s a person and not AI. How would you change your response to the comment in one case or the other? Both can lie, manipulate, tell half-truths, etc. The only difference I can see is if you believe you can prevent a living person from making or continuing to make a big mistake by responding, then spend some time on the response. If it’s a bot, you don’t. You submit interesting relevant factoids regardless because the non-bots (TM all rights reserved) might like them.
BTW, using stylistic features in writing to ID bots might be low-yield. Style changes are trivial to implement in any automated system, and they can be used to stylistically “blackball” particular human contributors. “I’ve heard that using ‘grey’ instead of ‘gray’ is a sure sign of a bot!” That sort of thing.