Director James Gunn has been dropped from Disney’s Marvel franchise “Guardians of the Galaxy” over old tweets. “The offensive attitudes and statements discovered on James’ Twitter feed are indefensible and inconsistent with our studio’s values, and we have severed our business relationship with him,” said Alan Horn, chairman of Walt Disney Studios, in a statement. Gunn, the writer-director of Marvel’s “Guardians of the Galaxy” franchise, apologized late Thursday after a series of old (now deleted) tweets resurfaced in which the filmmaker made what he admitted were “offensive” jokes about taboo topics like rape and pedophilia. More to come…