your mom causes friction

pam blogs about a smart mom here. it's worth a read and what i want to know is how on one hand this mother can say what she did and then listen to fall out boy with their lyrics such as "oh don't mind me, i'm watching you two from the closet, wishing to be the friction in your jeans." i like fall out boy and i'm pretty sure anyone who knows me well will atest to the fact that not much offends me, including the afroementioned song lyrics.
what does offend or rather confuses me is this woman's conflicting ideals. tolerance bad, jean friction good? more selective doctrine is the only answer i can come up with. same strategy employed by many a religious fanatic. cheers, kudos, and massive props to fall out boy for sticking to their "god-complex loaded" guns.