User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-13471981-20140814164741/@comment-3046679-20140814182151

That double assassinating in the cathedral, after the haystack kill. You clearly hear the hidden blade stab sound when he grabs the guy on the right, and then stabs the guy on the left with his other arm.

As to why they're being dicks to him, I'm just assuming that's the most likely reason, shallow as it is.