When people are careless with your feelings, it is because they do not care. One expression of narcissist traits is being casualized. Examples of that might be: not appropriate acknowledgment on your birthday; not carefully considered on how they treat your property; dismissing your feelings; and even endangering your well being by forgetting to be careful when they close the car door, or look for signs for distress in you when there is a possible emergency situation. Your best strategy is to avoid them all together.