Quoted from here:
Always look at heightism as a problem from the
perspective of the people who practice and perpetuate the prejudice.
Not from the perspective of the people who are negatively affected by
it.
In other words, think "why did John say that Steve wasn't even 5'6"
'on a good day' - does he mean that 5'6" is better than 5'4"'?
Do not
think "why did Steve get offended when John said that he wasn't 5'6" 'on
a good day'? Is Steve sensitive about his height?"