If you're referring to what I think you are (can you perhaps point me to another instance where you've made this point?), I simply disagree that the respective arguments in question are "similarly flawed".

One circumstance in which you can usually be safe in dismissing a minority argument is when the minority arguer has ignored the arguments already put forth for the majority position. If you want to be a contrarian, that's fine, but you can't expect to persuade the majority to your point of view without addressing the reasons they believe what they believe.