Correct. It's all just inputs and outputs. If you think you got dusted, move that input to a new address and be done with it. Probably cost you more than the dust is worth but it's worth it. Also, with some wallets you can select the inputs you put into a transaction. You could lilterally leave the dust in the address if you know what you're doing. Just make sure it never gets added to an output.

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And what will happen if like u use bitcoin like any other currency and spend all utxo + suspicious dust to some other value ?

I guess everyone manages their wallet(s) the way they deem fit. I haven't been dusted since the mempool war which lead to the block size war which lead to the Bitcoin shit-forks. Back then spam transactions were quite common.