Is it OK For girlfriend to Undress in Front of Gay Male Friend?

I'm dating this girl who is roommates with a gay male friend she's known since college. I knew they shared a bathroom, but what I found out only recently is that she'll shower when he's brushing his teeth in the morning, and vice versa.

Dude is pretty effeminate, so I'm confident that he's 100 % queer. But I don't think it's appropriate for my girlfriend to be displaying her stuff in front of him. (The shower door is glass). When I challenged her about this, she laughed it off and said I was making a big deal out of nothing, because "it's like he's my brother."

Okay, sure, that makes total sense... if you'd shower in front of your brother!!! Who is being unreasonable here?

Is it OK For girlfriend to Undress in Front of Gay Male Friend?
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