My friend (girl, overweight) who I hang out with more than the usual friend, pointed out my shorter height?

you did the right thing by being mature. trust me, girls take their weight WAY more serious then you'd think. you probably wouldve crushed her. so that's very well of you to not automatically attack her on her size. if she's really one of your close friends, just tell her that her making fun of you hurts your feelings a lot, and you'd like it if she would stop. she prolly doesn't realise she's hurting you.