I also don´t really understand what the issue would be. If a card tells me to reroll my opponents die/dice, i am the one who does the rerolling.
What you may need to understand, is that for many of us this is a breach of etiquette. For me this will span over 25 years so it is a deep part of my psyche.
Now, think of something that deeply annoys and offends you. Chewing with their mouth open, coughing and not covering their mouth, sniffling and not using a tissue, driving with their high beams on, not indicating when changing lanes, queue jumpers at the bank. And so on and so forth.
That is what you just did from where I sit.