By any rational standard, an organism that is incapable of reproducing has failed natural selection and is a genetic error.  So yes, things like lesbians are objectively abnormal if nature is any guide; however, the only thing evolution is really good at is throwing an endless amount of varation at the dart board to see what sticks, so these errors are normal and to be expected in that regard.  There will be different kinds of errors born to take their place after they die like "asexuals", so it's not exactly something a standard human can or really should try to solve since all of this is above your pay grade and will be regulated by nature in the grand scheme of things.

The only issue at hand with regular humans is when the genetic errors start to form coalitions and lobbies in order to lobby AGAINST non-genetic errors for their own selfish interests.  The scientific term for genetic errors lobbying against healthy cells is cancer.  They want short term personal gain at the expense of collapsing the entire civilization and system.  This is an extremely selfish and destructive path that has to be condemed.  The physical manifestation of such practices can be seen in things like "SJW-ism" and liberalism - cancer cells attempting to attack the functional cells.