Let 'em try. The only people I will tell my inside leg size is the British Police Department.
Fun fact: the British Police recommend that a bicycle saddle be set at 106% of the inside leg length, measured from the saddle to the fully extended crank. In other words, your ankle should be extended at the bottom of the stroke, and you should pedal with the ball of your foot. So if they ask, it is a legitimate concern. They want you to pedal with maximum efficiency. They care!
No, not really.
That's so one's leg breaks cleanly when, forced to cycle in heavy traffic by the lamentable lack of cycle lanes in GB, one is wiped out by a bus, taxi, or juggernaut.