No, that's only if you assume that the mode of inheritance is single-gene, which is not the case for the VAST majority of phenotypes. If LGBT conditions are genetically tied to other positive conditions, then it would be entirely possible, and, indeed, probable, that a negative condition would be selected for due to its accompanying beneficial conditions. But this would mean nothing for the phenotype's extent of beneficial effects itself.
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No, the person who said I went to some bible college thing was the one who brought it up.