The sickening feeling of confronting a guy who messages you anodyne things constantly, waits for every opportunity to ask you overly personal questions, and gets very upset if you tell them you do not feel positive about them and to please stop, and then eventually after enough times confronting them they get outraged by your lack of interest and say FINE I'M DONE
Some people don't mind this, but I am not one of those people, and will not be regardless of how much people try to "well it's no big deal so why can't I" to me