Really ? I mean we do see the XRays ? (genuine question)

Kind of, yes. X-rays do interact with the visual system and cause perceivable effects especially with dark-adapted eyes. It's not like seeing actual colours, though and more of an added effect.

Here's a fascinating article about the history of x-ray perception in humans and animals: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9426237/

UV and EMF radiation are further causes of these "warmth" effects. UV in particular is pretty bad and yes, you could actually get a tan from sitting in front of a (cheap) colour CRT monitor all day :)