His reply to this comment is totally out of line and I see he's been rightfully banned. However the comment you're replying to was just a poor attempt at humor, not a personal attack:
> Explain Lisp to people not by treating them as idiots who won't understand that not everything is a list.
>> I'm pretty sure people understand that "everything is a list" doesn't mean there are no primitive literal types in the language.
>>> I'm pretty sure you're an idiot.
Please consider context before calling out people like this.