That is not a personal attack on someone’s character. And it leaves the door open for the product to improve in the future, which he also suggests in the video.
The worst you can say is that it’s clickbait-y but mkbhd doesn’t usually use such extreme titles.
The twitter guy is saying mkbhd is attacking the creator of the product’s character.
MKBHD: This is "The Worst Product I Have Ever Reviewed…For Now".
Vassallo: It is "distasteful, almost unethical" to criticize a product like that.
Me: No, the way Vassallo challenged MKBHD's character is "distasteful, almost unethical".
The transition from explaining Vassallo's argument to explaining the problem with Vassallo's argument is a bit abrupt. It's not immediately clear whether you're referring to Vassallo or MKBHD at that point.
I think maybe a line break around "It is fundamentally", or switching the pronoun to a proper noun, might help it parse better. Overall I liked the way you worded it.
If MKBHD’s title was Why you shouldn’t buy the pin, it would have been better.
But I accept this interpretation is subjective. That’s why I said “I find that…”