[bigiain]

Might not be "on purpose", OP might just be getting caught in some blocklist crossfire.

It happened in a very similar way for a different conference here: http://www.slate.com/articles/technology/bitwise/2015/08/twi...

If they're in the middle of a Twitter dogpile, they probably wouldn't care too much about one particular guy on a blocklist if several hundred sockpuppet accounts organising on 4chan are all sending the same whining emails...

(They could have handled that email response more politely, but I can pretty easily imagine a situation where OP looks like part of the problem rather than collateral damage...)

[larkeith]

Honestly, whether he was caught in a crossfire, intentionally banned, or even received a response meant for someone else, this is still utterly inadmissible. There is no possible situation an email of this sort is acceptable in any sort of professional context, let alone coming from a conference organizer.