Is it true the 80s were a corny and stress-free decade?

No. Total misconception.
The 80's were split between 'The gamblers' and the 'Stay safers'.

The 'Gamblers' took risks.
With the banks; mass government share sell offs; the stock markets; new technologies; new thinking.
The 'Stay safers' tried desperately to cling on to a dying manufacturing base; outdated industries and old methods of working.

So stress was rife !

Periods of boom and bust economics meant you might sell your house for a fortune one year and then find you couldn't pay your new mortgage the next.
As industries died so unemployment became a factor.
More temporary jobs created than permanent ones. Meaning nobody could effectively plan much of their lives.

Doubt it - they started in a global recession and crime was sky high.

No more no less than any other.
Depends on your position in life at the time. They were for me as a teenager...but not for my parents who had a mortgage and bills to pay. Unemployment was very high and money was tight.

Corny, maybe. Stress free, absolutely not. Many of the same issues that we have today in society were also happening back then.

With the threat of nuclear war looming overhead it was hardly stress-free...corny absolutely!!!

Wars, strikes, riots, mass unemployment, Margaret Thatcher, why would we have been stressed?? Lol.

If you leave out all of the military confrontations...sure!

Not as I recall them.

That’s why I loves it 🤓

No
Only seems that way on TV or pop culture.
Here's some stuff that happened in the 80s.
HIV

Casual racism, discrimination.
Calling people a "fag" was soooo common.

Cocaine and the drug wars associated exploded

The Cold War and nuclear fears.