Doesn't matter. Next time Eddie asks to clue Iris in, Joe should refer him to Barry and see if his feelings have changed.
She's only temporarily moved in with him because she's fighting with Eddie, and she was definitely not living with her dad when Eddie and Joe were having their conversation. Here's the deal, though: the whole "As long as you live under my roof..." applies to teens, not grown women who are supporting themselves.
ETA: Am I crazy, or did Iris once say she wanted to be a cop until Joe told her she couldn't? If that's true, then Joe's been dominating Iris unpleasantly for some time. I still can't figure out what terrible thing he thinks is going to happen should Iris ever find out Barry's secret.
You are not crazy. In episode four, things are awkward between Joe and Iris. Iris asks if he's going to give her the cold shoulder like he did when she signed up to become an officer. She said he wouldn't speak to her until she withdrew her application.
There was also the stuffed animal incident, which I found a bit disturbing as well. When Iris was little, she broke a record of her fathers. It was a valuable one. So as punishment, he took her favorite stuffed animal away and refused to give it back to her.
I love Joe, but these instances with Iris are grating, and upsetting. The writers think that they're being funny, but really they are reinforcing the idea that women only have value when they do what men want or like.
When did he say it was because she is a girl?
1/ She is not a cop (unlike Barry, Eddie or himself) she is not trained to deal with matters such as this.
2/ She is his child. Of course he is going to be protective of her.
3/ If he thought she was so delicate and in need of masculine protection. Did he teach her to box or fire a weapon?
1. No, she isn't. Neither is Caitlin. Neither is Felicity. No one sees a need to protect them from any of the nastiness.
2. I realize this. But as I've said before, Joe is very domineering of his daughter.
3. He taught her those things. Despite teaching her that, he still thinks that she needs him to treat her like a little girl. It's the stereotypical, "Little girls are treasures that daddies must protect", instead of realizing that she is a woman of means and strength.
Based on the extended trailer they just released, it looks like lack of knowledge will not be protecting Iris much longer.