Their response doesn't show what kind of person they are, it is way too short of an interaction. They're done trying to talk to you and don't want to see what you have to say, so they told you that aggressively. Your replies also came off really passive aggressive, including this one.
But their point before was right, that you can still say a game sucks even if you're not a developer or whatever, with the comparison of not having to be a baker to know some bread you're eating is bad. The game isn't bad, but it sucks because the devs are working on stuff they don't need to yet. (Like, why make an Exodia skin instead of fixing other issues with stuff already in the game?) The game sucks also because of various issues people are having trying to play the game, like the person that stuff wasn't loading correctly so they just had a black screen with a few assets visible.