You have a complex. You believe that people are more likely to be disrespectful towards you because you're short. In reality, it is your self-conciousness about your physical shortcomings that makes you become more defensive towards people.
By noticing signs of disrespect, you're magnifying them AND you're only feeding your negative beliefs about yourself. Try to only notice the times when people respect you and be apreciative of those time, this will magnify them and will create a whole new set of positive beliefs in you.
The only people that get offended are the ones that want to be offended.