Do you agree with the behaviorist notion that proposes that it is not the situation per se that causes emotional responses; but rather the meaning attached to it?

I do agree; a terrifying life situation might happen to two people, the severity of the effect on the people depends on how they see it(attaching meaning to it)
For instance, personally, have run into some unhealthy relationship with friends and families members that almost cost me my life. As i thought i was ignored and not loved, sometimes lead to depression and low esteem. Until i looked for help. I had to understand that these things were normal, and my perception of some things are not correct.
Hope am still inlined with the question

Whenever you feel sad or anxious do you also resort to strategies that alleviate the symptoms of your painful feelings?

Sure most times, i tend to move away from the place or people that instigate the anger and anxiety

Nice write-up, love your analogy using Mr. B. I do understand it.