That's because Europeans are more of nonconformists and could deal with some 7 to 10 super hot days in a year. It's now weeks in a row.
Europeans are more accepting of being sweaty during the day.
Europeans? Nonconformist? That was funny.
If anything, the AC train wreck is caused by the society being incredibly conformist and conservative, trying to cling to the world of the 20th century that no longer exists.
Europe could never "handle" it. Even in 1990-2001, Europe averaged about 3 heat-related deaths per 100,000: https://www.statista.com/chart/36367/average-annual-heat-rel..., compared to about 1 per 100,000 in the Americas at the time.
3 per 100,000 is a lot. That's higher than the homicide rates in New England and the upper midwest of the U.S.