1) Girls justifying their past actions. Case in point.
2) Girls who have an irrational amount of hope for relationships- and will probably blame themselves when it doesn't work.
3) Girls who sit around on Pinterest all day and wonder why they're not going on any dates
4) Girls who are depressed and express that via pins on Pinterest.
5) Demeaning girls in general.
Having said that...Pinterest does also have some pins that cater to my snarkyness (snarkiness?) Here are just a few for your further enjoyment.