Hi Scott - It seems to me that you have to make a case-by-case judgment, but the general answer is sure, but only if the former friend is able to acknowledge in some way, whether formally or informally, that they are sorry and are ready to be a real friend, and if it is someone you care enough about to explore with them how they hurt you in the past by making you feel they were putting you down. Also be aware that maybe you are overly sensitive on the issue and their intention was not to put you down but you felt like they were.