A straight dude can be squeamish about dating a transwoman, that’s something different. Not everyone wants dick, I get that. But a straight dude dating a transwoman doesn’t somehow make him not straight. Marten is attracted to women, and is dating one. Nothing about this indicates he’s bi. What is there not to get here?

Just because you don’t think trans women are women doesn’t mean every guy thinks the same. Stop projecting.