LaDainian Tomlinson has ZERO sympathy for Broncos players who got wack haircuts this week ... 'cause back when he was a rookie -- he was hazed to the tune of a near $20,000 dinner check!!
We got the legendary Charger out at LAX when he told us the Denver hazing story doesn't even compare to what he went through as a first-year player in 2001.
"The late Junior Seau and the veterans hazed me by taking me to dinner and spending $18,000 of my money!" L.T. tells TMZ Sports.
Don't feel too bad ... Tomlinson not only went on to earn more than $56 MILLION in his career -- he tells us he "absolutely" repaid the favor to rookies when he was a vet!!