(And just when I thought the sexuality debate was going to be avoided...)
So you didn't read it - at least not properly. Also, even if you don't agree with something, that doesn't mean you shouldn't look into the other point of view.
Amielleon points out that Lethe and Ike have a somewhat romantic support - with her inviting him to come live with her in Gallia. As such, Ike was not exclusively gay. They support a bisexual or asexual reading of Ike - where he winds up with a man at the end.
Right, this is an argument I see freaking everywhere and it annoys me to no end.
I don't think it's so much the hug itself which makes people view them romantically. It's the placement of the entire base scene and how it's presented. It happens right before the final boss - a very significant space - and is the only base conversation of the stage. Micaiah doesn't get one with her opt-out love interest Sothe nor do any of the 'canon' pairings and that is quite important to bare in mind.
Then, instead of talking to, say, the Greil Mercenaries or his sister (both of which would have worked as a final base conversation) Ike talks to Soren - a character who loses quite a lot of plot relevance by the time the army reaches the tower. This, thus, makes Soren seem a lot more significant to Ike than any other cast member.
On another note, imagine if that final conversation had been with Ike and Elincia and he'd hugged her at the end. Reads quite differently, right?