Sprouts Farmers Market complaint: Horrible Check Out Speed

This morning I was in your store and had a very good experience until I went to check out. One lane open and a customer with an issue had everything backed up – waited way to long to check out. Another lane had a cashier working but he would not ring up orders as he was working on Instacart orders – so there I stand wasting my time. This happens all to often – I travel and shop at various Sprouts around AZ – I would say 3 out of 4 shopping trips check-out experience is sub par and frequently seriously below expectations. On the way out of the store this morning I complained to the manager, Mark Rains (Spelling?), and his response was derisive and turned things around on me by saying I didn’t know how to talk to people – to be clear I was obviously annoyed but kept my complaint civil and really resent Mark not recognizing his stores problem and then turning the issue back on me – HIGHLY inappropriate. I know Sprouts is working hard on improving merchandising and marketing to increase their revenue – please be aware I do about half as much business with Sprouts as I would otherwise do simply because of the frequent horrible checkout delays.