okay so i have this friend. let's call her Sarah. well Sarah is not the most attractive looking girl, and she is really obnoxious. she will randomely say things like "SEXXXX" and then like she makes these really disturbing jokes, and when no one laughs she will start cracking up for like EVER. me and my friend kinda ditched her, but we ended up getting close again :/ well now we want to become like just okay friends, but not BEST FRIENDS. she has a very low self esteem and she takes everything VERY HARSHLY. how can we let her down easy????