"Your body is not yours and do not abuse it" - Sri Bhagavan
Your body is just a temporary gift given to you by god.It comes from the nature and goes back to the nature.As long as it carries you, you can say that it is yours.Your body is like a vehicle which carries you.Do not abuse your body.Similarly do not abuse others' body.
The moment your soul gets separated from the body, it is no longer yours as it goes back to the nature.The same truth applies to others also.Therefore show respect to your body as well as other person's body.
Acharya Sri Samadarshiniji said that those who dislike their body will be showing tendency to attract negative things in life like failures, choosing wrong life partners etc.The same thing is applicable when we dislike other person's body.
Only accepting is the available option because " Acceptance is the bedrock for all spiritual growth" and the moment you start accepting, you attract happiness and joy more and more into your life and hence "Happiness is the index of growth" .
Sadhana
For example, if you dislike your tummy, then just touch it and say "How are you".