Was my dad being inappropriate with me?

I feel kinda weird asking this, but I'd like to get some other opinions.

My dad used to smack my butt, which I know might be normal for parents to do to a little kid, but he only stopped doing it around the time I was 18 about three years ago. It never seemed sexual or anything like that, just more playful than anything, but it still made me feel a little uncomfortable. I never said anything about it though in fear of making it more awkward. He never did anything else like that when I was younger, as far as I know.

Anyways, it somehow came up in conversation with a friend of mine and she said that he was basically molesting me which... I don't know, seems a little far-fetched to me. I don't know if maybe I'm just trying to justify it though, which is why I'd like some more opinions.

Sorry, I know this isn't the best place to probably ask this but I prefer the anon feature with this one. Thanks for any advice.
Was my dad being inappropriate with me?
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