I have always been uncomfortable with this but I was speaking to dh about it the other day and he said it was strange and slightly inappropriate. In other words he wouldn't do any of this himself.
Its regarding my step dad. Mum met him when I was 7. I didn't really take to him. The first time I met him he put my new mouse toy in a pint of beer. 
Anyway, mum and him got married quickly, within 7 months of meeting, he moved in. He used to hit my mum on a fairly regular basis, a few times in front of me. This in turn made me dislike him even more than I did anyway. I wouldn't say he made a particular effort to 'become my father figure' for want of a better phrase, but wanted me to see him as 'Dad'.
Thats a bit of background in case its relevant.
The oddness imo is :
-He used to walk around naked. Mainly at night time, but he would always walk from the bathroom to his bedroom after a bath, after drying himself with a towel and leaving it there. If he went to the loo in the night, although this one I can kind of understand.
-He always used to leave the bathroom door open, whether it was for a pee/shit/bath, it was always open.
He used to take the locks off the bathroom doors. I told my mum once it made me uncomfortable and wanted a lock (teenager, privacy and all) , she asked him to put one on and shut the door, it never happened.
-He used to snoop through my room occasionally. The reason I found out was because he used to pull me up on things like my washing pile, or cups that should be in the kitchen etc.
-He used to play 'games' . He used to take one of my favourite toys and hold it out of my reach and make me try and get it from him. Fine, until I got upset and wanted it back, then he would throw it out the window.
-He used to say I would be pretty if...I has different colour hair or lost a bit of weight etc. I must have been 12+
I'm sure theres more but I cant think at the moment. 
Dh has said he would never do any of the things I have listed. Especially once that child had reached teenage years because it could make things uncomfortable.
I have no idea what I'm getting at here. I have never liked him, I have no respect for him after the way he has treated my mum in the past. They seem ok-ish now but I feel really uncomfortable around him even though I barely see him now. If I visit my mum I tend to try and go in the week when I know he is working and I will not let myself be alone with him. Gut just tells me to get out.
Is it me being stupidly paranoid, is he just a comfortable in my own skin person and I am just looking for more reason not to like him? Or is it odd?