Organisers of the Lakeside World Darts event have hit back at former winner Eric Bristow's claim that this year's final was like watching "amateurs".
Klaasen (left) put reigning champ 'Barney' to the sword in the final
Bristow also said new champion Jelle Klaasen would be "killed" in a match with rival world champion Phil Taylor.
BDO spokesman Robert Holmes said: "Eric should have more class than to say what he did. You can't describe fellow pros or a great final in that way.
"Eric was a great champion, but Jelle Klaasen is the new kid on the block."
Bristow won five British Darts Organisation world titles in the 1980s but is now affiliated to rival governing body the Professional Darts Corporation.
Taylor won his 13th world title in total at the PDC-organised championship at Purfleet earlier this month.
Klaasen, 21, surpassed Bristow as the youngest-ever world champion with a 7-5 victory over Raymond van Barneveld in an all-Dutch final.
Holmes added that Klaasen's triumph in the Lakeside final, seen by a peak TV audience of 4.2m on BBC Two, was proof that the BDO system is better at unearthing fresh talent.
"The Lakeside World Championship has a habit of throwing up new names." he said.
"It shows the strength in depth the BDO has that Jelle had to win 10 matches to become world champion - five in the qualifiers in Bridlington and five at the Lakeside.
"We now have a world champion who is not only fit but he doesn't drink or smoke. He is a very dignified young man and a worthy champion."