How should I react to this?

Well, yesterday my dad and I went to stare loony Christmas shoppers in the eye to find the perfect gifts for my mom. So today, I tell her that I want to go shopping with her for dad. What does she say? "Oh, I'll just pick him up something on the way home, you don't have to go." So I'm thinking, okay.. Maybe she just wants to get him something herself. She gets home and all she has for him is some new socks. That's it. Seriously?

I don't know, it's just I feel like she backed out on me about shopping for my dad. And avoided coming home before she went to get him something.

At first I wasn't going to make such a big deal out of it, but then I had to go under the tree to get my cat to stop messing with ornaments and I saw the socks wrapped up. No bow, no name tag, just a clumsily wrapped package with 'DAD' (really, she doesn't even write his name?) written in barely visible marker that she didn't even bother to box. We have boxes, so it really shouldn't have been that hard to put in a box.

And I sat there holding it and felt like crying. ***I know Christmas isn't all about the gifts***, but come on. We don't have any money problems or anything. So I talk to her about it and our conversation went something like this.

Me: So you know all dad got was one gift...

Mom: Really..?

Me: Yeah, and it's socks.

Mom: Ha ha, well how many did I get?

Me: Nine.

Mom: Well good~

Me: ...

And then I just lef the room. She doesn't feel the slightest bit upset that we gave our sweat and blood to get her gifts and all she has in return is some socks? How should I handle this?

By the way, I can't drive, so I couldn't have gone to pick my dad up anything by myself.

And, their marriage isn't what you call good, so I guess it's sorta expected. But come on, it's Christmas! And at least my dad put up some effort and didn't seem to **want** to be mean.

PS: I know this was really long, when I'm upset I tend to write lengthy stories and mess. If you've read all of it, thank you.