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I think there is a balance here. I agree that you can’t just be as blunt as you want and not be perceived as a jerk in some capacity. Some people are just negative and use “honesty” as an excuse to attack. With that in mind, there are also the types of people who bottle up every thought they have until they eventually let it out in passive aggressive or gossipy ways and that can actually be much worse than if someone is willing to be open about their feelings.
A lot of people who claim they "have no filter" are just assholes or outright bigoted. They convince themselves that they are simply  more honest and everyone else secretly agrees with them because then they can frame their bullshit as being brave. >

Right, and if you object they frame you as being intolerant.