My bf said it’s a “turn off” to use sex toy

I told my boyfriend that I’m bringing my vibrator to his house so that he can hit it from the back while I use it and he said that it’s a turn off that I want that.  then he asked me why I can’t just use that when I’m alone and I said I don’t know. I just thought it would be hot to do it while you’re hitting it am I in the wrong ?he sounds insecure to me I was surprised from his response. I was like wtf..??? What’s the big deal. Then he asked “why do you need that..?” Like I don’t need it but I thought it would be hot that’s it!