I've never claimed to be a nice person. I can be spiteful, vindictive, passive-aggressive, catty, and cutting. I dislike children and refuse to respect people based solely on their age. I am irritable, demanding, and a little high-maintenance from time to time. I am also a cynic. I almost always see the glass half-empty.
No, I'm not a nice person.
But I do help out my friends and family, I do give people I care about the benefit of the doubt. To those I am close to I am generous to a fault with. Am I altruistic? No. The plight of children in Africa does not move me. But if a friend is suffering because his family is treating him like shit, I'll be there for him. When a friend is miserable in his job, I will be there to support him and to encourage him to find something that makes him happy.
Even when people I care about say things to me that hurt my feelings, I will still care about them.
And even though there have been a few notable exceptions to the rules, they are just exceptions.