"Semperfi was challenged to back up his claim that homosexuality is abnormal. He doesn't really have to back it up, because the statement is self-evident."
An unsupported claim can not be supported with another unsupported claim. That is called arguing in a circle.
"Nothing holds water better than a shape with no holes, just like the shape of your argument."
" The acceptance, or lack thereof, of self-evident truth does not change the fact that it is truth. "
It seems self-evident that you have a chip in your head that makes you say ludicrous things, like maintaining that 'self-evident' is a valid substitute for making an argument or presenting evidence.
Self-evident means the contrary is a logical contradiction, like 'square circle'