Lindsay Lohan -- Hey Tom Brokaw ... Why You Gotta Be So Mean?

Tom Brokaw is a bully ... so says Lindsay Lohan ... who's telling friends the legendary journalist's harsh comments about her ruining last year's White House Correspondent's dinner were totally uncalled for.

Brokaw refused to attend the gala this week, claiming LiLo ruined it for him simply by showing up last year.

According to our LiLo sources, LL isn't particularly bothered by negative comments -- BUT does feel the newsman is publicly picking on her for no good reason ... and that's just plain mean.

We're told if invited again, LiLo would be happy to go. She had a great time last year as Greta Van Susteren's guest and everyone was super nice to her, including Rick Santorum who took a photo.

So here's a song Tom can listen to, while NOT attending the event ...