I tend to respond using the same terminology a questioners use when I answer their questions.
If the questioner asks in terms of degrees Fahrenheit (°F for short), my response is likely to use those units, but parenthetically might also use degrees Celsius (°C for short) or kelvins (K for short), or both. If the questioner asks in terms of degrees Celsius I might toss in a parenthetical kelvins -- but not degrees Fahrenheit. Finally, if the questioner asks in terms of kelvins (K for short, sans the degree symbol), those are the units I'll use in my answer.
As an aside, the correct term is kelvins rather than degrees Kelvin or Kelvins. The spelling should be lowercase (kelvin rather than Kelvin), and the degree symbol (°) is superfluous. That the units are in lowercase when spelled out but uppercase when abbreviated is an extreme honor. Only a very small number of scientists have been metrologically recognized to the extent that have lowercase units named after them. Lord Kelvin is one of those scientists. Respect his name and lowercase it.
In addition, the degrees prefix in degrees Fahrenheit or degrees Celsius indicates that those scales are not absolute. The kelvin scale is absolute; the use of the degrees symbol in conjunction with the temperature unit "kelvin" (K for short, sans the ° symbol) is not needed and has officially been deprecated.