Why are SAHM's so judgemental of working moms?

Im starting off by saying not all SAHM'S are, but lately I swear I am getting into it with every SAHM I meet! Im told that I have it easier cause I work and go to school and don't stay at home all day. That SAM'S have it harder cause they are a nurse, psychologist, cook etc. Just because I work and have s hool does not mean when I get home I don't cook, clean or take care of my baby. All good moms take care of their kids regardless if they work or not. Sorry, but being a SAHM does not make you a licensed RN, a trained chief etc. You are just a SAHM, just like I am a working mom. I chose to do school because I need to be able to support my family if something happens to my husband. Once I finish school I will likely only work part time to spend more time at home with my kids. It just makes me so mad when SAHM s say their job is harder. It is SO hard being away from my daughter at work. I think about her constantly. Being at home with your child takes that ache away. That in itself makes your job a bit easier. Not easy, just easier. I should add I know what it is like staying at home. I did no for 4 months with my daughter.