Cessna 150s are reluctant to spin, usually preferring to spiral dive despite one's best efforts to spin it. During my PPL we used to do flick entries to spins - that usually worked!
However, like many aeroplanes that don't usually readily spin, sometimes the C150 will spin quite viciously in a very real and hard-to-recover spin. But I suspect, as has been said, that a non-pilot would not know a flat spin from a normal one, or even from a spiral dive.
I practiced flat spin entries and recoveries with Genna (Mr Yak) in the Yak 52. They felt quite different to 'ordinary' spins and required in-spin control inputs in recovery. The rate of descent was prodigious!