There is nothing wrong with letting bad ideas come to the arena. It's the best way for the good ones to prove themselves worthy of everyone's attention.
Remember, bitcoin is anti-fragile, so the more it's attacked the better.
And if you just want to filter out the noise and shut youself down in your own corner, altough that affectively gives more space to the shitcoins, you are also free to do so. Also, not all battles are worth fighting for.
Balance the time you have and the time you really want to spend towards others, because you won't ever get it back.
I'll leave you with this Ayn Rand clip about Altruism. Just replace giving money, with giving time to others - which is basically the ssme as we know.