Am I right to avoid an old friend who I heard dated a 15 year old girl when he was 24?

We are both 31, but back when he was 24, I saw a women post on fb about her 15 year old daughter dating a 24 year old man. If I remember correctly, my old friend and the girl were commenting and defending it. I just feel disgusted about it, and never looked at him the same way, so I've just been avoiding him ever sense.

Am I right to avoid an old friend who I heard dated a 15 year old girl when he was 24?
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