I just don’t like people wasting my time.
Today I had a visitor at work, who obviously had a lot of time to kill and trapped me in small talk forever. All we had to deal with businesswise, could have easily been discussed within five minutes. To be polite, I would have happily spent another ten minutes to sit with him through his coffee. To exchange a few pleasantries and get to know each other better. No more.
He arrived at one and left half past two. What a nuisance this guy was.