I could rant about the people who try to get random strangers to come be their hjealer, but I won't. That's what I have the Anonymous function for, and a single polite tell is an annoyance I can put up with when I forget to go back to Anonymous.
But if you sent that single polite tell, and the person you were trying to get to come babysit your red bar says they are not interested, that's it. Done. Over.
When you send further messages to try to badger them into it, after they've already declined, you're just revealing yourself to be stupid and extremely rude. You're not going to change their mind, you're just going to tick them off.