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A big problem is that you're even thinking his serves are illegal. He's got you not thinking about your game anymore and worry about him cheating on the serve instead of playing properly. Anything to get you away from thinking about what you need to do next.
Think about when someone Cho's on their points. It may not bother you, but you still might notice it. And that thinking about how they cho'd and how they sound rediculous, and how you're not going to let it bother you and how your just going to keep playing your game the same way. well all those thoughts normally wouldn't have been there, and they achieved their goal of distracting you from thinking real table tennis thoughts.
I wear a nike headband, and I wear it so the logo is upside down, intitially I did it by accident. A club member noticed it and told me that it was upside down, I laughed and said whoops. However I didn't fix it I just kept playing, I noticed he kept looking up at my forehead so I decided to always wear it upside down from now on. About a week ago, I was playing a player named Tien. He was wearing an addidas headband upside down. In my head I said "copier! that's my thing!" He's a friend and I asked him why he was wearing it upside down. He responded telling me that mine kept on distracting him. Anything to take their mind off the playing man.
This is a classic post. For real.