How would people from the 1960s have responded to the COVID-19 pandemic? ?

Groovey question.  Hmmm...  Young people were super defiant in the 60s, so my guess is that half would defy the orders.  Those who followed them would wear masks made out of psychedelic paisley prints with lots of fringe and probably not much else.  The older generations were much more complaint, but I don't believe any business owners would have put themselves out of business just to follow a "hunch" that, say, the virus might be transmitted in restaurants.  (There's still no proof of that.)  Peace! 

Certainly not. The U.S. was still a free country then & no one would consider destroying the U.S. economy over a flu bug. the U.S. was still a free country based on individual freedom of choice then.

when the Asian flu (H2N2 virus) world wide PANDEMIC hit in 1957-58 with U.S. deaths @100,000+ & world deaths @1 million + It was ignored & the country continued with business as usual until everyone had been exposed & gained immunity to the virus.

The exact same response took place during the hong kong flu (H3N2 virus) world wide PANDEMIC with U.S. fatality's over 100,000+ world over 1 million+. 

Absolutely.  During the 60's people were very respectful of authorities, and did not question medical advice.

Doesn't seem like a "Hobbies & Crafts" question

They would have been much more openly strict obeying the rules and those that disagreed with the rules would have stayed out of sight.