Paul: ... But, silver lining, you won't have to deal with John Constantine if you join the Justice League. He's got no connection to the League, and no fans on the League. At no point will he be invited to any meetings, nor invited into the field to operate alongside other Justice League members. You will never have to worry about Constantine joining the League either, as a quorum of members will never approve of him.
Anna Fortune: Who the fuck is Constantine?
There's a difference between telling everyone, and telling someone who specifically voiced an objection to Constantine. (Or even telling someone whom you can reasonably surmise would voice an objection to Constantine.)