Yeah I think what I’ve seen online is that people are very insecure in their sexuality and they are attracted to Yamato and that if he is a guy then that would make them gay. I believe Yanato is Trans and view Yamato as Trans, but I totally get people who may miss out on what I find to be ( somewhat ) subtle but important details that tie up Yamatos identity. This may be a small but important note - gender is a performance, and clothing affirms gender but that's only because we have a standard for genders that that performance reinforces - tl Dr you can be a Trans man and look however, big breasts or feminine clothes or a feminine face do not remove your Trans identity.

Social transitioning is JUST as if not more important than physically transitioning and Yamato enforcing their male ness and it being reinforced through socialization as a male with men in social activities for men IS Trans as hell. It's so direct that the panels are next to each other and they're both composed to parallel each other. I'm guessing you might be anime only so I won't spoil a future scene not yet animated, but there is an explicit page in the manga where Kiku and Yamato are paralleled very explicitly in a social setting and shocker - Kiku is with all the women and YamaBro is with all the dudes. Yamato is shown with cuffs BECAUSE that's the bint that they want to break out of them, they're literally shackled. I bring this counter up because often people will say ' Yamato just wants to be Oden ' and that their arc is about self acceptance as Yamato but that's literally never been an issue, they never hated themselves, they just wanted freedom and Oden was that vessel for wanderlust.

I view Yamato as male, he self describes as Oden but his arc isn't about realizing he's not Oden - Yamato had a call to adventure and to be themselves because they had a shitty abusive dad and their freedom is their arc.

Who does yamato like one piece