Bans are not at intended to "notify" the banned user.

They're not to impress them, or make them feel bad. They're mostly there to _protect_ the rest of the users.

It's super cool that you prefer the "drive-by" style of trolling. And it's also fine if you crave the validation of a ban so much that you are unhappy if miss it. 

_Bans are not a reward for successful trolling and the lack of notification is a feature in this respect._ ¹

Don't forget there are also the high-intensity trolls that derail a chat room and generally make it unusable for a prolonged period of time.

That's aptly prevented by small, time-limited bans.

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¹ inb4 Request for badges on repeated bans