This is exactly why I would never be caught dead on Spirit. Sartre got it right, "Hell is other people." My issue with Spirit and other budget airlines as a frequent traveler was never about the planes, the staff, or the operations, it was always the other passengers. It's bad enough dealing with people in general in the circumstances we all find ourselves in stuffed into an airplane, but budget airline travelers are generally exactly the sort of folks who ride the bus, which is why nobody wants to ride the bus in the US.
I say all this as someone who enjoys public transport when I'm in Europe and has no problem flying budget airlines in Europe like KLM Cityhopper or EuroWings, because everyone across society uses public transport and budget point airlines in Europe. In the US though, public transport and budget airlines are nearly only used by people who you'd rather not be stuck near for hours at a time for fear of being attacked, coughed on, or otherwise somehow harmed even if minimally which is entirely avoidable by just not.