2) Pat Beverley

This is the small, overly aggressive, I-have-issues-because-I-play-in-a-league-of giants, kind of irritant.

What Beverley lacks in height he more than makes up for in terms of tenacity. Sometimes this ends disastrously, like the case where he infamously took out Westbrook's knees in a playoff matchup between them. This was a couple seasons ago, and he made (and tripped) his way into memory lane when he nearly did the same thing again this season.
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Most people know that "rock the baby" is Westbrook's celebration. He's earned the right to "rock the baby to sleep" after a thunderous dunk or yet another shaky jumper. No one has ever been the league's scoring MVP while averaging a triple double. No one.
So when Westbrook did it on Beverley after scoring, it seemed perfectly natural (Westbrook has a son and two daughters). However, Beverley's audacity to do it to the Thunder after he scored seemed very irritating, not just to me but also the Thunder themselves, who promptly worked themselves into a frenzy.
A lot of smaller guards are irritating and maddening, but none as much as Pat Beverley.
Honorable mentions: Jamal Murray, Chris Paul.