Yeah, that sounds like really bad advice.
Personally I would read this as a weak, but noticeable signal of being a person who is okay with taking advantage of others. Most people are too embarrassed to ask complete strangers for actual favours.
I don't think so. Last week someone asked me if they could use one of my climbing equipment for a moment and I said sure. They asked me in a friendly manner and I had a positive feeling of them afterwards.
Jeez. It happens all the time in the normal world.
Your calibration is wildly off. Asking people for a spot is totally normal at any gym with free weights.