Talk about sore losers ...
A couple of bitter Lakers fans thought they would take out their disappointment by heckling Kendall Jenner at Staples Center ... right after her boyfriend, Devin Booker, DESTROYED the Purple and Gold.
The idiot fans cussed out Kendall as she walked to her car -- saying things like, "Get the f**k outta here!" and "Go back to Phoenix, you're not welcome."
One of the guys shouted out TMZ -- but NONE of the people involved have any sort of affiliation with us. At all.