Problem to Look at X-Mas Lights?

brooklyn19 asked on the random questions thread the following question:

i’ve got a real question (i’m not a fan of starting my own thread so it goes here)

is it true that you’re not supposed to look at christmas lights? that there’s tumah in them? i’ve heard this more than once and it just doesn’t seem to make any sense to me.

Someone suggested she start a new thread for this but she was uncomfortable doing it so I’ll do it instead.

anyone have any input?

And I know someone will ask why I wrote xmas instead of spelling it out. My answer is that this is the way I was brought up to call it. So lets add to the first question another question for debate here – should we yidden call it xmas or christmas?