What should a lady do if a male roommate keeps kicking her out he bathroom in the middle of her being in there?

Whats wrong with my roommate? Months ago he kept making me exit my shower in the middle of it so he could shower. He hasn't done it in a while. Today I came home and he aaw me and said hi or something and i said hello and he was smiling kinda big I don't know he's a weirdo. Soon after i went in the bathroom and like 2 mins into me using the toilet he started knocking repeatedly saying he just needs to get his towel out. Da hell? Basically he made me get out just so he could get his towel out. Why?
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And before someone says why do i keep leaving the bathroom? Cause he keeps knocking. I dont feel safe saying no to a male especially when im naked in the bathroom. Its scary
What should a lady do if a male roommate keeps kicking her out he bathroom in the middle of her being in there?
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