How tolerance is applied depends on the perspective of the individual who is being tolerant. In this particular case, I think the two concepts below apply:
It can mean the acceptance of the differing views of others, and fairness toward people who hold these different views, or
It can mean the act of putting up with somebody or something irritating or otherwise unpleasant.
In the first sense, the individual being "tolerant" does not neccessarily accept the differing views themselves, only that the individual accepts that others have differing views, and treats those others with fairhandedness regardless.
In the second sense, the individual being "tolerant" is actually not accepting of others or things, but is suffering to remain neutral, for a miriad of possible reasons (e.g. not wanting to cause a scene, out of politeness, out of fear, etc.).
I suspect that many people talk of the first sense of tolerance, but in reality, tend to function in the second sense of tolerance.
Subsequently, though the first sense of tolerance takes time and experience, once achieved, it can be maintained indefinitely with no effort, and is sincere, wherein the second sense of tolerance can be generated instantly, but requires a great deal of energy, and can not be sustained for long. It is also hypocritical.
my thoughts
v/r
Q