It's worth noting that the code in question was also open sourced and permissively licensed by the original author as he stated in the thread[1]. I guess this isn't really about licensing at all, just the original author seems to think it was rude, and also doesn't want to accept any of the apologies that have been offered.

[1]: https://github.com/Modernizr/Modernizr/pull/684#issuecomment...