To be clear, I'm referring to your pattern displayed in this thread of aggressively taking words outside of context, and not doing a bare minimum effort to try to find reasonable context for them. In this case, it was probably not worth anybody's effort to explain the words to you; this is true. The fact that you're taking it personally as an attack is on you though, not me. Because I don't intend for it to be an attack, I'm simply stating that a lot of unnecessary time was wasted, and unkind words were slung for no good reason. None of it was worth it, because the value you've gotten from now understanding the phrase was not worth the amount of time it took to teach it to you. It's not even just because you weren't very receptive to the information, truth be told, we were maybe also poor teachers here. But I'll give you more information for your time:

A common theme among many English idioms is that a phrase is found in one discipline (ie. the medical discipline), in this case "bedside manner." Some deeper meaning is extrapolated, in this case it is "showing kind, friendly, and understanding behavior for people in your care." And then the phrase is re-used in other disciplines and contexts where the deeper meaning is what is intended to get across to the recipient hearing that phrase, rather than the literal interpretation (ie. the bed isn't necessarily involved at all.)

As another example: "curiosity killed the cat." There's no cat, and it's not necessary that people will die when this phrase is used. It just means "sometimes following your curiosity leads to bad consequences." Hopefully this lesson has helped you the next time you come across an idiom and wonder why they used that choice of words.