You're fucking kidding me, right? Do they laugh at you?
You're making no sense. So your stance is "not really" (i.e. something other than "hell no") on standing at attention when a lieutenant is simply addressed by a captain, but you don't expect a salute?
No it's not. It's a fucking horrible way. What's the matter with you? You need a reg to require those junior to you to stand at attention such that you can "exert your authority"? Are you really this big of a pussy as an officer that you can't exert your authority any other way?
There is one thing--and one thing only--that the 'stand at attention' line in the regs (it's the protocol reg, by the way) is good for and that is this: when someone junior bows up to you with that chickenshit "we must adhere to standards or the enemy will win" argument to point out failures in uniform wear or mustache width (which along with PT tests seem to be the only things that fall into the SNCO "standards" category these days), you can throw this "standard" back in their face because sure as shit they won't be standing at attention by default when you're talking to them because that's absurd. If "standards" are that important regardless of context that TSgt Snuffy can throw his "I am charged by the CSAF to enforce standards because I am an NCO" crap, then I sure as shit can use this as a teaching moment to point out to him that if that's the case, he should be standing at attention or the terrorists will win. It tends to put "standards" in a bit of perspective.
I hear this all the time from NCOs but I've never in my entire life seen an officer go out of his way to avoid a salute. Not even once. And I've been around quite a while. I believe that it happens, but I don't get why. How fucking difficult is it to salute? Why is it a big deal for anyone, O or E?