EXCLUSIVE

Ivanka Trump just had a bumpy start to her Xmas holiday ... an out-of-control passenger on her flight began verbally berating her and "jeering" at her 3 kids.

Ivanka was on a JetBlue flight leaving JFK Thursday morning with her family when a passenger started screaming, "Your father is ruining the country." The guy went on, "Why is she on our flight? She should be flying private." The guy had his kid in his arms as he went on the tirade.

A passenger on the flight tells TMZ Ivanka ignored the guy and tried distracting her kids with crayons.

JetBlue personnel escorted the unruly passenger off the flight. As he was removed he screamed, "You're kicking me off for expressing my opinion?!!"

BTW ... Ivanka, her family and bunch of cousins were all in coach.

8:35 AM PT -- JetBlue just released a statement, saying, "The decision to remove a customer from a flight is not taken lightly. If the crew determines that a customer is causing conflict on the aircraft, the customer will be asked to deplane, especially if the crew feels the situation runs the risk of escalation during flight. Our team worked to re-accommodate the party on the next available flight."