While your intent was correct and it is sweet of you to want to share one of your gifts and passions with another pony, the point of 'treating everyone equally' describes treating them with the same measure of respect, kindness, generosity, and willingness to acknowledge their status as equal to yours. It does not mean you cannot or should not acknowledge difficulties or differences, merely that they are not lesser for them. Remember, it is never wrong to be considerate when you can be, especially when giving gifts. Perhaps you might discuss this with your friend, Rarity?