I don't think that not having tried to make games means that you can't talk about games ^^'
That being said, I think this person does not realise they're commenting on a jam game, which means a lot of things might have been chopped off an idea just to go to core mechanics. We experience this often when presenting our jam games to friends, they tend to stop on every detail we knowingly ignored because we thought it was not very relevant and necessary for the jam.
It's cool that you reacted and got him to appologise for being so harsh, though.