The clients don't communicate directly with each other so your opponent doesn't have your connection details in order to impact you. Any traffic they send to the Live server will impact them.
https://www.chess.com/blog/News/how-to-adjust-your-live-chess-connection
https://support.chess.com/customer/en/portal/articles/1444918-my-internet-connection-is-fine---why-am-i-getting-disconnects-
I was playing this player and about to win then suddenly I lost contact with chess.com, after I regain contact my concentration has been disturbed and thus make a mistake, he later on won the game due to my mistake. This player had used the DDos attack to disturb his opponent which is the technique to be considered as totally 'Ungentlemanly' in Great Britain standard. I really hope that chess.com will make this site 'Great Again' by reducing the DDos attack to the minimum, thank you very much for your concern! and your help!