You can't really love yourself unless every single person you come in contact with likes you. This includes disgruntled Bed Bath and Beyond employees and abusive ex-boyfriends. After all, how do you know whether or not you deserve your own love until you successfully earn the love of all those around you?
Being well liked has great perks like free t-shirts and leniency, making it more important than being kind or being flexible. Make the effort to be well liked in the glory days of high school because when you're middle-aged and paunchy you can reminisce at barbecues and people will think of you differently.