Its like saying are NFT's helping prospering the crypto currency market or whether NFT is ruining the crypto space? You get my point here? Meme are meme's with their specific portfolio such as low value, diluted market, unlimited supply, just there to joke on social network and use their funny pics. The value rises based on pump and dump volume rather than its use case. So it's either flourishing in its own universe or downgrading itself. But as whole crypto remains unhampered with it.
It is not the same thing really, when you are using NFT, you could use it differently, or you could simply do an "art" scam thing that is understandable and you can't say NFT is bad by default, or you could have some other thing that you could discuss if it is good or bad and there will be some who use it good, and some who use it bad.
But, memecoin as a concept is bad, there is no scenario where a memecoin could be something decent, they may not be a scam, like doge is not a scam, I get that but you do not have to be a scam to ruin crypto. You could be just a meme that ruins peoples financials because they are focusing on "fun" part when money is not to be joked about.