Most people in general. A lot of people think they're much better at small talk than they are, and blame the other guy when an interaction doesn't go as smoothly as they hoped, or there's an awkward silence.
People who are excellent at small talk have to be very charismatic and seem genuinely interested in the conversation even when it's very boring. Very few people are capable of either of these things, and in my experience it's actually management & marketing types who are the worst at both.