In my experience, the only time anyone ever mentioned it was a delivery guy who complained to me about tipping on the credit card when I added enough tip to make the total a round number for me.

He said it made the tip-count more difficult at the end of the day. Math is hard, I guess.

So I accommodated this guy. On future orders, I rounded down to make it an even number for him. He got less in tips, but hey - the math is easier.