"but whatever" are two of the most dismissive words when put together. "I see what you've written, but whatever."

It depends on context. When someone raises a potential objection and then says "but whatever" they are being dismissive towards their own objection. This is also called "letting it go" or "moving on".

And posting direct links to the places where discussion actually happens along with providing tldr context is as constructive as you can get. But whatever :)

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