Listen to Mustn'ts, child, listen to the Don'ts.

Listen to the Shouldn'ts, the Impossibles, the Won'ts.

Listen to the Never Haves, then listen close to me.

Anything can happen, child, Anything can be. ~ Shel Silverstein

The poem is barely related to what I'm about to say, I just like it

I've seen a lot of shoulds and shouldn't going around RPW lately and am reminded by one of The Great and Powerful Whisper's oft repeated turns of phrase:

Should just means "I want"

Of course there are things that we should do because we have negotiated them with ourselves or our partners. I should make dinner because that is one of my agreed upon chores. My husband should take out the trash because that is one of his agreed upon chores.

The key is that these are things we agreed upon. If I were to say (without discussion) that my husband should mow the lawn himself because that's a man job, in reality, I'm saying "I want him to mow the lawn because I think it's masculine". That does not mean that he should mow the lawn. He could have any number of ways to get the lawn mowed, I just want him to do it himself because of my own personal values.

Should, in this context, sets up a covert contract of sorts. I've decided that he needs to be doing something that I desire. If I haven't discussed with him what I want (to view him as masculine) but instead say "mow the lawn", I'm setting us both up for potential failure.

This can also be applied when giving advice. As RPW moves more and more in the direction of Traditional Values, we see a considerable amount of advice that states what an OP's partner should do because this community wants OP's partner to do that thing. Advice like this is often a waste of the time it takes to type. If a man doesn't pay one dates, or text enough, or cut out all the thirst traps or whatever, saying he should behave in a different way is not advice. It is us telling an OP "we want your man to behave differently". She wants that too, she doesn't know how to do get him to behave differently and ultimately she is only capable of changing herself.

Wanting someone to do something is a desire and no more. And as Laura Doyle points out, communicating your desires is much more powerful than nagging or demanding. When you find yourself saying "you should" try to rephrase it to "I want" and start your communication there.