Lindsay Lohan tossed from bar after throwing glass at Samantha Ronson

(HMG) – Lindsay Lohan, 23 but going on 12, has reportedly been banned from a club for throwing a glass at ex girlfriend Samantha Ronson.   Samantha was DJing at Trousdale, in L.A., Friday night, and went to sit with her friends when Lindsay stormed over and threw a glass at her head, eyewitnesses at the club tell a New York Post Page Six reporter.  Despite the incident 32-year-old Samantha continued to party, and wrote about the incident on twitter.

“Just got a glass thrown at my head. … Hmmm – wonder who did it?” SamRon posted on her Twitter page at 1:30 a.m.

“Everyone was shocked,” says a source. “The night was going fine, and all of a sudden, for no apparent reason, Lindsay walked up and caused a huge scene.”

Sources say Sam continued to party at the club after the incident, with one Ronson pal adding that “Sam is used to Lindsay’s bizarre behavior, and wasn’t about to let it ruin her night.”

Lohan, meanwhile had no direct comment on the alleged incident, but later tweeted the following:

“Last night-never again-believe it or not she’s done with the club scene i’ve learned my lesson-sometime’s it just takes a glimpse of reality.”

But the lesson wore off quickly as the train wreck was out partying the next night according to reports.

Meanwhile one of Lohan’s former close friends tells TMZ virtually all of her friends have just given up on her.

The ex-pal, who requested anonymity but we know was very close to Lindsay, says, “talking to Lindsay is like talking to a wall — and if you ever say anything negative to her, she cuts you off.”  The friend described her as “a lost cause.”

As for getting Lindsay help, the friend says several of Lindsay’s buddies have tried reaching out to her mother, Dina — but she is in total denial.  I am with Michael Lohan, let’s get his daughter locked up, post haste.