Looks like he is not working in the "office". He is a TEACHER!

I just can only image that his students love him to the bits, especially when they start to behave as their "teacher" and expose his bright ideas when trying to get a job - they must have huge success.

If some one would tell me on T-SQL interview that "We, SQL developers, do not use IDENTITY as it's just MS SQL Server proprietary feature and it's completely crap candidate for PK", I would just ask one more question (just for having some fun): "What other crap and proprietary features of SQL Server you don't use?" then thanked candidate for attendance and get him out of office.

At the same time, may be his students are trained to be trainers? That is fine...