[unclebucknasty]

Can relate to your entire comment.

There's definitely a cadence of "followups", that tips into passive-aggressive. "Perhaps you missed my last email" or "if you're not the right person, please pass it along". The entire frame is that you owe them something or are somehow being rude by not replying, even when it's obviously automated spam. And they are positively relentless.

I find the approach especially grating and won't do business with these type, irrespective of what they're selling.