Johnny Gill -- You Can't Sue Me for What I Say on Twitter!

New Edition star Johnny Gill thinks a new lawsuit against him is total BS -- because he thinks people shouldn't be allowed to sue over what gets said on Twitter.

As TMZ first reported, Gill is being sued by a record producer who claims Gill damaged her reputation by claiming (on Twitter) that she leaked one of his songs on the Internet.

But yesterday at LAX, Gill told our photog he thinks people should say what they want on Twitter, because otherwise "the courtrooms would be filled with a bunch of Twitter people complaining about things people say every day ... It's freedom of speech."