Is the iphone 6 screen scratch resistant from rough napkins?

Can paper towel and slightly rough napkins like the ones from mc donalds scratch iphone 6 screen? My friend accidentally spilled some sauce on my phone so i had to clean with the rough mc donalds napkins and some paper towel since that's all i had at the moment. Found a few scratches on the screen after but i wasn't sure if it were from before or from the napkins/paper towel.

Anything can scratch it unless you have a protector on it.
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I guess it could, but only very finely. If you're going to get a phone that expensive, protect the thing.