That is quite alright. He has his interests, and you have yours. There is no need to go out of your way to convert him into loving yuri. According to Professeur Le Venn, the three interests are equal and equally respectable.
So as long as he respects your love for yuri, you too should respect his love for traps. There is no higher order, yuri brings peace for all. Yuri does not discriminate. Yuri does not judge.
Unless of course, he talks shit about yuri, in which case, perhaps a holy war should be in order.