Yeah, it's pretty well known that danielkerr (the maintainer of OpenCart) is pretty toxic, and (imho) very questionable in terms of competence.
Some of the other things he has said:
* In response to an accusation of stripping license from copied open source code: "fuck off!" [1]
* In response to a support question about a session error: "are u stupied!" [2]
* some others [3][4][5]
[1] https://web-beta.archive.org/web/20141018114521/https://gist..., which is a copy of https://web-beta.archive.org/web/20141018110346/https://gith...
[2] https://forum.opencart.com/viewtopic.php?t=49240#p237193
[3] http://www.websynn.com/2011/04/11/daniel-kerrs-opencart-secu...
[4] http://www.websynn.com/2012/01/10/opencart-update-daniel-ker...
[5] http://www.techchattr.com/never-use-opencart#comment-1091055...