Is it called something when people argue with nonsense or unreasonable reasoning? I'll try to give a specific example using a silly subject, a cupcake
We eat Cupcakes because they're tasty. Lets say one day we wake up and find that 1/5th of all people find cupcakes bitter and not tasty. Someone who is a fan of cupcakes might say "the reason why people eat cupcakes is for the sugar rush" which is obviously not true. Another person may say muffins don't suffer bitterness in 1/5th of people like cupcakes do so they should serve muffins instead. The fan might say but muffins can't be used to soothe cuts because it lacks icing; which is ridiculous thing to say because noone actually would use icing to treat a cut, we want cupcakes so we can eat them
Is there a name for the way the "fan" argues?