Sexual harassment from my GBF

One of my closest guy friends is gay and I've been having boundary problems with him. I don't get sexually harassed by the straight men in my life.. or if I do, it's so subtle I don't even notice it. But it's not like any of them have ever slapped my butt or grabbed my boobs to "adjust" them. My friend, however, has no problem with doing any of that. I feel like he thinks that because he's not sexually attracted to women, he can touch them however he wants because he's no longer a "threat." He grinds up all over me when we go out to clubs and it makes me so uncomfortable. I'm not okay with how he's been touching me without my consent. I've tried talking to him and he just tells me I'm being sensitive. I know that when he looks at me he sees a friend he has no sexual interest in, and therefore a safe person to do whatever with. But, when I see him, I see a man who is repeatedly violating my boundaries, sexually harassing me, and reinforcing the notion that I'm a sex object. The fact that he's gay doesn't take out the misogyny. It just gives him an excuse.