I may be naive, but I don't think this is how most men are. I think they would expect that your home, as a single woman, would be decorated like a woman would decorate it. A pink couch would almost be expected. If you were cohabitating and you have a pink couch, that's when gender norms may start to clash. Tempered with complimentary decor, it may not still cause concern for him. Like it or not, there are gender norms when it comes to color. There is something about a guy that has the confidence incorporate pink into his wardrobe or his home furnishings. However, too much pink is going to be emasculating.

To me, it would only be a problem if you were cohabitating and it looked like your home and you were just letting him live there. I've witnessed men in relationships where their opinions on home decor were maligned. Something like, this:

Man: "Hey honey, what do you think of this chair?"

Woman: "Oh no! That is just hideous. What are you thinking? Look, just give me back that catalog before you hurt yourself."

Man: "Here you go." << withdraws from the conversation altogether >>

Many men appreciate how women can bring color into their lives (both literally and figuratively). However, they don't want to lose their own identity in the process. When he starts to look around the house and cannot recognize any part of it that makes it his home too, that is usually when he starts to yearn for a man-cave.