Those weren't lesbians, that was Ben Solo and Rey, though I can understand how there might be confusion.
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But I concur it seemed outta place. It seemed like a slap in the face to characters such as Finn & Poe that she chose the genocidal, parent-killing, maniac who attempted to murder not only her, but those she cared about the most on multiple occasion. It completely threw the chemistry she and Finn developed in TFA out the window, and downgraded her morale as a protagonist considering she fell for the one character who stood against everything she stood for, minus one good deed at the very end. Made no sense to throw that in there. They could've parted ways as having a mutual understanding and forgiveness of his past (though how is killing your father and wiping out villages something to easily overlook?), but the romantic smooch seemed a bit much. (Imo).