It's just designed with a slightly different set of assumptions.

Instead of water freezing and boiling 100° apart, it's 180° in fahrenheit. That makes it so that they're on the opposite sides of a temperature gauge, and a degree of rotation of the gauge matches a degree of temperature.
Instead of zero being the freezing point of water under specific conditions, it's a brine solution whose temperature will stabilize in a way that's useful for using as a calibration point.

Stripped of its context, it's odd. But it's not irrational, just no longer consensus as the standard, and as such deprecated.

100°F was supposed to be average human body temp. Guy who made the scale fucked up his math and we ended up actually at 98.6°F

If farenheit represents how humans feel then 50 is the most comfortable temperature right?

Thankfully that has been redefined using the Boltzmann constant, so now anyone in the universe can agree on °C and K without needing to measure any Vienna standard ocean water.

It's all arbitrary. Someone just decided to base a scale off of something and that something isn't fixed from the start. The meter used to be based off the measurement of the earth, but now it's based off of light.

It's just some random semi-useful starting point that we all agree on so we're using the same language.

It can be -20 C and you can be still fine with jeans and a jacket if it isn't windy.

What I'm saying is temperature alone doesn't tell you the whole story.

Yep, and I've been in 110C in sauna. It's pretty fucking hot but not death

Being from a particularly hot or cold location doesn't make you immune to heat or cold, it makes you a connoisseur of heat and cold. You get better at recognizing gradations of extreme temperature (knowing which are uncomfortable and which can literally kill you if you're not careful), you learn how to plan ahead and dress for the weather, and you develop emotional coping systems for extremes.

But if it's either 100°F or 0°F, no matter where you're from, that's a temperature to be wary of.

Yeah, often it is just way more convenient to use the Kelvin scale without any negative temperatures for some calculations and formulas then Celsius