Well...
1. Insane: I'm simply scared about how weird my sim will turn out hahaha
2. Unflirty I think it's called? I just don't see why you would block yourself from having a chance at love if you find the one; although, it might be pretty funny and relatable to see a slim awkward at that type of stuff.
3. Hates Children: I'm okay with other sims (like Sergio Romeo) having that trait, but my own sims tend to have at least one kid or a kid sibling and it can be sad to see them yelling at them and destroying their dollhouses (yes, Serg destroyed little Chrysanthemum's dollhouse once. Sniff sniff).