My first account was hellbanned after my first comment (I was stupid enough to make a joke). I had no idea for weeks, and hellbanning also makes the site incred

My first account was hellbanned after my first comment (I was stupid enough to make a joke). I had no idea for weeks, and hellbanning also makes the site incredibly slow. I only realised after I logged out and the site was fast. It's absolutely absurd to hellban someone after 1 comment (and it wasn't racist, aggressive, etc). What's wrong with warnings, or at least telling me I was banned?