Every generation, a number of deleterious mutations occur in the human genome. Some are not really that bad like left handedness or being prone to eczema. Natural selection removes a portion of this population. LGBT and so on is a mutation that also tends to be self-correcting as these mutants rarely are fertile. So there’s really no need to be phobic about these unfortunate mutated beings but it would be wise to avoid sex with their relatives as your children might carry the mutated gene.