The forum is littered with public instances where Sombre has been "not so nice". The last modding thread I interacted with him in he kept freaking out because he didn't think we were answering the original poster's question properly. Ultimately the original poster responded and said we were answering exactly what he was asking.
Here is the thread:
http://forum.shrapnelgames.com/showthread.php?t=45313
A quick search of his replies would bring up similar threads where he was basically trying to e-bully people for god knows what reasons.