[schubart]

> If I don’t hear back from you in [N] days, I am not going to do XYZ, considering you don't deem it to be important.

Sounds even more confrontational.

[closewith]

Yeah, let's soften it up:

> I'm going to proceed with XYZ in N days. If any of you fucking idiots have a problem with that, then scrawl it down in crayon and flush it down the jacks, which is where you'll end up if you dare question my decisions in future.

[Xmd5a]

English is not my first language and I have communication issues. Having said that you may be onto something unironically. Respectful conversations often pack more tensions than downright disrespectful approaches, such as the way "cabron" can be used affectionately in a group of Spanish friends.

[lozf]

Don't forget to accidentally make a typo in "regards" so you sign off just calling them retards.

[mewpmewp2]

That is much, much better, because you dropped the passive part from passive aggressive which people hate the most.