The Mean Girls star was reportedly eager to step into the spotlight at Roth's gig at the University of California's Santa Barbara campus when he performed his track "She Don't Want a Man."
But Roth refused to bow to her demands and ignored her altogether after tiring of her pestering, reports the New York Daily News.
A source tells the paper, "Lindsay was bugging both Asher and his management team to get onstage during 'She Don't Want a Man,' but Asher was so annoyed by her requests that he actually skipped performing the single."
Lohan took to her Twitter.com page to vent her anger, blasting Roth for failing to show her and her friends any attention.
She wrote, "Wow. Asher was cocky to all my friends and not that nice."
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