SAGe and SAG eligible, SAG-AFTRAe and SAG-AFTRA eligible do not belong on your resume.
Andy Bonanno • Brandi and Jackie, I was a casting assistant for 10 years in a right-to-work state. I can tell you from experience that casting directors know SAGe is not a credit. It is a term used to describe actors who are in a must-join situation. You are eligible to join and must join before you work another union job. If you are hired for a job where an actual union member should be hired and you do not join, then the production must pay a fine. It is true that you don't have to join, but that has absolutely nothing to do with the contract the production signed with the union. The production is incentivized by that penalty to not hire you.
In most right-to-work states, it only means that the production can not force you to join in order to gain employment. It doesn't prevent them from hiring a more-professional "union" actor instead of you.
Art has a certain passion about the union and you took that passion as being directed at you personally. Art was not picking on you. However, your last post was a personal attack to Art and was inappropriate in this forum. This is a tough business and you will need to have a thicker skin if you are going to survive in it.