I'm no Ms. Manners, but this sounds polite and appropriate to me. I think passive aggressive would be something more like: "Since I think it's so rude for people not to send thank you notes, I wanted to be sure and send you one."
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In the midst of hate, I found there was, within me, an invincible love. In the midst of tears, I found there was, within me, an invincible smile. In the midst of chaos, I found there was, within me, an invincible calm. --Albert Camus
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