One of the popular memes on social media which I enjoy is simple:
When you can be anything — be kind.
Good advice for multiple situations.
Does a neighbor give a grumpy response to your greeting? Be kind — smile anyway.
Does another driver on the road block your lane change? Be kind — draw a deep breath and keep your hands in a polite position.
Does a child ask 100 questions in a row? Be kind — you were young once.
Kindness is good when dealing with plants also. Remember they are living. You’ve not need to break leaves or stems in fun or anger. (Well, if it prevents doing bodily harm to a human it would be an good alternate.)
However, do not consider all plants defenseless.
Mix caution with kindness when dealing with Crown of Thorns. The delicate, tiny blossoms cling to a strong defense system.