Not everyone is open minded right as they claim to be?

I heard this term before

“ It’s better to keep somethings in your heart and not express it”

Isn’t that a selfish way of saying that we will not accept and be open about certain things we see from someone expressing it or even doing it?

What happened to being open minded?

It’s like me not telling anyone that I am sadistic especially when I am sexually involved with someone.

I tell people upfront then suddenly this is one of the things that someone remembers about me
Not everyone is open minded right as they claim to be?
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