Did you ask him why he thinks you're in denial?
I think sexuality can be complicated, and we try to make it simple. We try to fit all the nuances of our attractions into little boxes -- "gay", "straight", "bi" -- and I don't think things are always so neat and tidy. We can have different kinds of attractions to different people. We can like certain types of bodies, genders, ethnicities, ages, etc. Why are our attractions labeled just by the kind of junk someone has? It seems really one dimensional.
I think some questions I'd ask myself is: Do men get me hard? Do I find male bodies erotic? Do I find masculine men erotic? Do I find feminine men erotic? Do I fantasize about men? Etc.