I watched the movie last night, it was largely a rushed hot mess and it will likely flop.
But the Venom symbiotic coming out as gay was not an aspect of the story, There was a joke scene, but it had nothing to do with the symbiote's sexuality, which if it has one, it's straight like Eddie is since it also kinda feels for his ex.
People are just kneejerk retarded with their "SJW are ruining everything!!!!" nonsense.