2:15a The spiritual man judges all things,

A person who has the Spirit is able to judge/examine/evaluate everything.
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⌊On the other hand,⌋ people who have received the ⌊Holy⌋ Spirit can understand/examine everything.

2:15b but he himself is not subject to anyone’s judgment.

But people who do not have the Spirit cannot judge/evaluate the people who do have the Spirit.
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And yet the ways/thoughts of a person who has the Holy Spirit cannot be judged or evaluated by anyone else.
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And yet no unbeliever can judge the ways/thoughts of a person who has the Holy Spirit and decide whether what he/she is doing or thinking is right or wrong.

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