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I'm not a native English speaker and I tend to make this mistake if I don't think twice.
This time I just typed without thinking twice, hence the outcome.
This thread derailing into a discussion about my spelling mistake will probably make me think thrice before I write this word the next time. :D
You can frame the nitpicking positively: "a good comment like yours deserves good grammar/spelling: I think you meant ..., not ..."
My spouse indicates that before initiating constructive criticism it is appropriate to inquire if the subject is receptive to such communication.