There can be things about a sport you don’t like, and you can normally go about your business avoiding them, pretending they don’t exist and enjoying the games. But this week, it was impossible to ignore one of the worst rules in the NHL.

The instigator penalty is a utter detriment to the league.

If fighting is going to be allowed — and it should be — it has to come organically. You know, exactly the way the Rangers’ Dylan McIlrath went after the Bruins’ Matt Beleskey last Friday afternoon.

It started when the Boston forward recklessly threw Blueshirts alternate captain Derek Stepan into the boards on a late hit that broke two of Stepan’s ribs, set to keep him out for four-to-six weeks. The clueless officiating crew of Wes McCauley and Chris Rooney hardly noticed the play, which could have been called any combination of interference, roughing, unsportsmanlike conduct — or a five-minute major for boarding. And even if they had managed to do their job with a modicum of aptitude, McIlrath had a job to do, too — sticking up for his teammates.

He went right after Beleskey and started a fight, which, mind you, Beleskey accepted. It was a decision Beleskey likely regretted after the 6-foot-5, 220-pound McIlrath landed punch after punch. But when the ice chips settled, it was the Rangers defenseman getting an extra two minutes for instigating — the Bruins scored on the power play — and a 10-minute misconduct. Tacked on top of the five minutes for fighting, he couldn’t play the next 17 minutes.