"Traditions of men"

In line with the new Topic for this month, I am often told that I am following the traditions of men by following Torah. Which makes me wonder:

1. What is the true definition for "traditions of men"?
2. Are all traditions of men sinful?
3. Can we support someone with a tradition they follow if it doesn't cause them to sin?

What are your thoughts on this?

#lawsofmen #manmadelaws #traditionsofmen