Well, that's a bit derogatory, but regardless, it's not that simple or that easy. Most people have this thing called "tact", and unless they are violently outwardly opinionated you wouldn't be able to determine their opinions on something like that just by saying something like that (which would be uncharacteristic for me anyways), as well as the fact that I've expressed distaste for him when he's spoken ill of trans-people and the like in the past, so he'd suspect something was up rather immediately. He's not an idiot.