How do you read a statement such as this, considering its tone?:
"So why exactly US post and congress and CDC and FDA and judges are exempt from mandatory jabs? Answer this you lunatic pathetic cult followers without a brain..... Yeah. do it. Tell us why."
I read this as indicating that the poster DT-waw believes there is something unfair, or nefarious going on in regard to vaccination mandates. Why indeed are some agencies exempt and others not? Well, had the poster correct information to begin, he/she would realize: 1) their own information is defective, and 2) The Administration's mandates can apply only to those bodies, private and public, that the Executive branch of government has Constitutional or statutory authority over. One need not look to conspiracy, willful unfairness, nor deceitful intent to understand why some agencies, companies etc. are mandated while others are encouraged to adopt mandates.
There's no doubt that the poster believes mal-intent on the part of the Biden administration. He could have posted something a bit more clearer and added more value. But so could you have.
The fact of the matter is that the postal worker's union is resisting the vaccine mandate and the Biden administration won't likely be able to stop them from resisting it. It is also factual that Biden has no authority to pass an EO that congress or the judicial must adhere to. But that questionable legal nature hasn't stopped him from trying to force OSHA to pass requirements to force the whole of private industry to vaccinate.
There are clear double standards being executed here. Whether it is true malicious intent or just incompetence isn't going to be known or solved by you or I, or the original poster.