Agreed - except that I would use a different word:  "uninformed."  I don't think traditionalists are dishonest.  I think they have received an edited version of church history that omits women - such as the women canonists who sang the early office, and women deacons, etc. 
Additionally, we don't know for sure who was or was not an apostle.  If I remember correctly, we do have two separate lists (with disagreement about 1 name).  The implication is that there may have been more than 2 lists - we won't ever know for sure.  
But if one looks at the qualifications for the category "apostle" (personal call, followed Jesus, "sent"/given a mission) Mary Magdalen fits as well as any of the males listed.  Mary Magdalen was sent to the male disciples to announce the resurrection and to inform them that the risen lord would meet up with them.  Further, Mary of Bethany "sat at Jesus' feet" - which is the common description of the disciple of a teacher.  Again - I agree with you.