My ds1 (14) smirks and sniggers at my younger dcs (12, 10 and 7) whenever they speak at meal times.
Obviously, they take a bit of time to say what they want to say but often end up in tears or upset because ds1's behaviour.
I have told him off. I have explained to him how demoralisinv it is for dcs confidence. How we listen to him when he wants to speak without smirking.
He doesn't care.
He'll just go to his room, smash up a laundry basket or a plastic storage box.
I don't enjoy being his parent. I think he's showing cruel and bullying traits that I can't seem to eradicate.