Read my first post in this thread. It is not about the slight advantage.
Sounds like it's about gamesmanship. Next you can measure his racket, comment on his dampner being in the string bed, shoes too rough for clay court, tennis attire not to club standards, placement of towel, sunglasses reflexing sunlight, type of balls used, stealing a sip of water after 1 game switch, etc. Get into his head and have fun!