As a European I can perfectly feel the 0 degree. I step outside and 5 seconds later I can tell you if it's below zero or not.

For me "it's now really hot" in summer is exactly when it's over 30C. It being 86F doesn't make any more sense. Approximately above 35C I will avoid going outside. Which would be 95F, not 100. From here, the temps in summer in the south of Europe are often around 100F at peak. Above or below doesn't matter.

All that Fahrenheit scale is good for is if you live in a continental climate, more to the south, e.g. some useless place like Oklahoma, where 0F is approximately year low, and 100F is approximately year high.

For all other places, where the temperature delta over the course of the year is not as extreme, this Fahrenheit scale is as unintuitive as celcius, e.g. you just get used to it.