One thing I hate is people who degrade themselves and very directly (but not always intentionally though I always notice) insult you.

Example:

Last year. Khay Shern. I walk up to him, Cambridge Exam results were coming out. I initiate conversation, ask about his marks. He says "oh they're not very good".

I later find out he got a 98% in Maths.

I got a B.

So if 98% isn't very good, what the hell is a B? Horrenous?

Just, a thought.