Access to what had until then been an 0day.

Ibrahim Balic "ruined" it, though public bragging (which is not responsible disclosure).

Ruining access to a 0day sounds like a good thing to me. I don't want people to have access to 0days.

Some people dislike the term "responsible disclosure" and believe it's not a moral imperative:

https://hn.algolia.com/?query=author:tptacek%20responsible%2...

Of course what Ibrahim did wasn't full disclosure either, so he shouldn't be fully congratulated. But bragging about it was better than keeping silent about it in this case.