When giving advice, "How I Did It" is not bragging.
When putting others down, "How I Did It" is bragging.
The trouble arises when the people being advised had asked for advice when they really just wanted their feelings and opinions validated.
Advisee: "I can't get a date. Please Help!"
Advisor: "It's easy, all you have to do is ..." <*launches into a simple process that works more than half of the time>.
Advisee: "None of that helps. You're making me feel worse. I'm reporting you to the mods..."

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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.