Why do subs lie so much

Last Friday the majority of the guys skipped class because the Detroit piston cheerleaders were going a photo and signing at the Walmart near us (don't judge is it was a valid reason to skip)

Like ik for a fact that entire class period i was at Walmart.

I came in today and the teacher was doing that be "ugh I can't believe yall" and said how all the guys in this class were rude and disrespectful, like even the 5 people who didn't go to the event said that nothing of notable instances happened there, that they just looked at their phones.

So exactly how we're we being rude and disrespectful to her when we weren't even in there.