Off topic, but one person being intelligent in a field you're potentially not familiar with does not make you "not smart". Putting yourself down isn't cool or honorable.
That being said, I'm also extremely curious what's going on here :)
Feh, it's just a slight incompatibility with the ways you two communicate. Some people think "hate" is too strong of a word to be used lightly, and it can get awkward when they talk to a person who casually says "I hate <name>".
Being unaware of a detail in a specific field does not imply lack of intelligence, but lack of intelligence probably does imply ignorance of field-specific details. Perhaps the commenter is truly claiming to be unintelligent.
Off topic, but one person being intelligent in a field you're potentially not familiar with does not make you "not smart". Putting yourself down isn't cool or honorable.
That being said, I'm also extremely curious what's going on here :)