Jake Paul is now the No. 14 cruiserweight in the WBA rankings … and you know who’s pissed about that?? The guy who was the No. 14 cruiserweight heading into this week — 20-0 fighter Craig Parker.

TMZ Sports spoke with the now-No. 15-ranked boxer about the development … and he said, quite frankly, it’s “disgusting news to me” because in his opinion, he hasn’t paid his dues.

“For him just to take a position that guys like me that struggled to find ways to the gym and … it’s a long road to be where we’re at. And for him to just be No. 14, it was just like a slap in the face.”

Parker — who won all 20 of his bouts on his record by knockout — says the math isn’t adding up … ’cause he’s always looking to take on the next big challenge, while Paul went up against a guy like Julio Cesar Chavez Jr., who was a middleweight champion a decade-plus ago.

Parker does appreciate what Paul has done for the sport — especially women’s boxing — but believes the opponents he’s taking on don’t give him much credibility, let alone consideration for a spot in the rankings.

Parker thinks there’s an easy way to settle the matter — he wants to fight Jake Paul to see if he really earned his position.