Mom embarrassed of me ebf *update*

My mom and I are going school shopping for my 5yr old she asked if I was bringing my 6 day old I said yes because I breastfeed shes like why cant u pump I told her I produce enough milk to keep him happy so shes like your starving your child I said no she said she would prefer me pump before we go so we ain't walking through Walmart with my boob out because its embarrassing that I just feed him anywhere I go she doesn't like that I am exclusively breastfeeding and not pumping until I have to what do I do do I respect my moms wishes and pump or stick to my ground with EBF

*update*

So I breastfed while we went out to eat and while we went to walmart she kept covering me up she was like everyone knows what your doing u dont have to flaunt it but got mad cuz he was crying. I was so glad to be home