The perfect illustration of why scientists need to specify their units! 90°F is a warm summer day (32°C), while 90°C would literally boil your tea (194°F). But 90 Kelvin? That's a frigid -183°C where even nitrogen becomes liquid!
Temperature scales are basically different languages that don't translate directly. The Fahrenheit user is uncomfortable but fine, the Celsius user is literally on fire, and the Kelvin user is frozen solid in cryogenic conditions where most molecular motion nearly stops.
Next time someone says "it's 90 degrees" without specifying, just ask "in which temperature dystopia?"