Same for me with not using the card-only checkouts. Not the same with the $100s, though... I used to do that all the time but then about 8-10 years ago, it suddenly turned around and store people look at ya like you're some criminal trying to use counterfeit bills... acted like they never saw one before (self checkout wouldn't take them at all) and at one place, the cashier actually called out to the manager *loudly* "Hey Bill, she's trying to use a $100 dollar bill, what shall I do?!" Lordy, color me embarrassed. Sheesh.
@Trade