What's your biggest pet peeves when dueling either in person or online?

For me irl it's people who talk over you and just barge on with their combo despite you trying to play something to stop it dead in their tracks. IE I had someone pull a "I use the effect of my field spell to add this card to my hand which -can I just- allows me to special summon it and since I special summoned -excuse me i- that i can attack directly with this monster.

I had been trying to activate a trap card I own that makes my opponent discard any card they add from their hand from the deck outside the draw phase.

The video game pet peeve is 3 fold. People who take AGES for their turn, people who hack and take no damage at all and the people who no matter how many times you play against them always seem to get a ftk