Do working moms really not like SAHMs? Are the Mommy Wars for real?

Ok what is the deal with Moms fighting other Moms? I am a Stay at Home Mom and really like being home with my kids, but why do I feel like I need to apologize for it? It’s as if working moms don’t think I have anything to talk about other then potty training and preschool. I do! I read. I watch TV. I’m a woman, wife, daughter, sister, etc along with being a mom. Any other SAHMs feel like that? And for the working moms out there, am I imagining things? Do you feel like SAHMs don’t have a lot to contribute? Do you think we don’t have anything in common? I just think we’re all moms and we all make our own choices in life. There should be no judgement either way. Why can’t we all just get along?