It looks like BlueMatt interpreted "wanna work on coinpunk" as him asking for developers for a project rather than explaining that he wanted to work on it.
netg also responded inappropriately:
01:17 netg What's the best NodeJS-IDE for Mac?
01:19 warren netg: how is this on topic for this channel?
01:20 netg wanna work on coinpunk
01:21 netg offical bitcoin foundation funded project
01:21 netg is this channel only bitcoind and bitcoin-qt?
01:21 BlueMatt netg: no advertising here
01:21 netg what is wrong with you
01:21 netg öol
01:22 netg forget i
01:22 netg t
01:22 netg stupid#
01:22 Luke-Jr BlueMatt: .
01:22 Luke-Jr he was on topic kinda
He probably wouldn't have been banned if he hasn't spammed 5 lines afterwards. I still think the ban and initial response were unnecessary though.