Can a corporal in a team leader position have me do corrective action (“smoke” me)? And was I wrong to tell him to eat a bag of dicks?

Congratulations on being selected for Junior STEP. If you haven’t heard of it, it’s a new longer leader validation program that tests selectees on their bearing, confidence and knowledge of military regulations.

They clearly assigned this NCO to your gun because they want to see if you’re willing to “guard your flank against any rank”. You clearly passed the first test. Time to show how bold and in charge you are. Don’t reverse course. If you do you’ll be flagged as lacking confidence and will likely have to wait longer for promotion. If this “CPL” attempts to exert his authority anymore then go further. Tell him to eat the whole bag. If he continues, match his tenacity by demanding to “stand in front of the Commander”, you have to use that specific terminology. When you do, they’ll further test you by having you sign Article 15 papers. Don’t be dissuaded, it’s all a part of the process. Just continue to keep your trajectory. Once the opportunity presents itself you’ll have the opportunity to appeal for a Court Martial. That’s the goal. The military justice system doesn’t typically have the time or money to pursue them and they want to know if you’re savvy on how discipline works.

The Army is looking for go getters and you obviously caught someone’s attention. Just remember that they’ll test you at every turn. You might feel scared, it might feel deadly real but just keep in mind that they’re assessing your determination. You sound like a smart guy and you clearly have the backbone for the Corps. Congratulations on your impending promotion!

Your argument that he is wrong because he recently became an 11C and you had been one for a longer period is invalid. There are other ways to handle the situation. As long as his directions are not immoral, illegal, or endangering, you do what he directs.
I'm surprised you can decipher the complexities of indirect fire but not the simplicity of military courtesy.
You are fortunate to not be sucking dick for beer money.

They can try, wont work out well for them.

This has nothing to do with experience over rank. And the "safety issue" also has nothing to do with your actions. They are all justifications or excuses for your demonstration of why you are not yet prepared for a leadership position yourself. Regardless of what you wrote, you still don't seem to "understand and respect his rank". Nor give any idea that you understand he may have been insecure in his new role and had his back up just like you. Instead you have taken a posture of "He made me do it". He was wrong on his calculations, and you should have been willing to help him grow, not just blow off steam. Picking on inexperienced newbies is a tradition, not a rule. Respecting rank is what makes the whole thing work. Even the dickheads.

I have read through a number of these responses. For the life of me I don't understand how you could not realize that you are the Corporals subordinate and wondering if you violated military protocol. Depending on your record and if you had similar offenses or were a shitbird they should have hit you with a summary court martial or at very minimum field grade Article 15. Learn from your mistake and next time, take it to your platoon sergeant or someone over his head with your concerns. Sometimes you have to remain silent even if you don't want to.

Doesn’t figure in the end. Admittedly, he was wrong. But so were you in what you said. What service and rank are you? It sounds like you were Army. But still, it was what you told him that automatically makes you in the wrong.

You need to manage your anger and find a better way to declare a safety HOLD. He's an NCO!
I ran into a similar recurring problem with a Corporal. I started doing "exactly" what he "told" me to do... Eventually we had a private "one-on-one" discussion when we were able to talk through the issues and work together going forward.

You better believe you were wrong! As a retired 1SG you would be smoked under UCMJ and on MY EXTRA DUTY LIST! You respect the rank not the man! This disagreement should have been taken to your squad leader, and Platoon Sgt. so now enjoy your punishment!

If he was the team leader, then it doesn’t matter one bit who’s been doing what longer. You are definitely in the wrong and I can’t believe you didn’t get written up for that.

I get the feeling that you know already that you were wrong, but you came on here to see what reaction you would get to your response.. Although it may have sounded funny at the time you failed to obey a superior officer. You were wrong.