This is a disingenuous answer. You pretending that being a jerk is equal to unsportsmanlike conduct is playing make believe. Tons of stuff is being a jerk but doesn't come close to the level of unsportsmanlike conduct.
The actual rule says unsportsmanlike conduct,
includes, but is not limited to, such acts as failure to comply with the direction of the referee, pushing, shoving, swearing, taunting, intimidation, baiting an opponent, throwing ear guards or any other equipment, spitting, the clearing of the nasal passage in other than the proper receptacle, repeatedly dropping to one knee to break locked hands, indicating displeasure with a call, failure to keep shoulder straps up while on the mat and failure to comply with the end-of-match procedure.
The closest application for a leg cradle (or for being a jerk in general) would be taunting or intimidation. But any ref that is trying to parse evil intent from appropriate actions is guilty of massive overreach. If the wrestler isn't actually doing something wrong, it is not the job of the ref to try to figure out if the right actions somehow have wrong intent.