Let the haters hate, but Metta World Peace is all about the Lakers honoring their In-Season Tournament win with a banner ... telling TMZ Sports the accomplishment now gives L.A. bragging rights over the Boston Celtics!!
The Purple and Gold are reportedly hanging a memento in the Crypto.com Arena rafters to commemorate their recent title ... which was met with mixed reviews, considering the tourney doesn't hold nearly as much weight as winning the Finals.
We spoke with Metta -- a 2010 NBA champ -- about the move .