Sure there is, you just relate to bad writing to anything but already established lore. It's plenty easy to criticize a relationship for having no place in a video game without having to say it's unrealistic for the character to be involved in a relationship.
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People criticize the writing of everything. I don't see why homosexuality should be exempt when it can be written poorly as well. As for criticizing what someone does with their time, who is anyone to say what is worth spending ones time doing or what's not?