When does teasing become verbal abuse?

I've tried to think of a few answers to this questions, but because this topic is so broad, I'm sure I missed many points of view. I would love everyone's thoughts (and examples) on this.

Total Votes	% of Voters	Female Votes	Male Votes	Unspecified Votes	% of Female Votes	% of Male Votes	% of Unspecified Votes	Average Age	Answer
2	2.7%	2	..	..	6.5%	..	..	..	All teasing is abuse.
4	5.3%	2	2	..	6.5%	5.9%	..	50.3	People who get upset by teasing are too sensitive.
50	66.7%	25	25	..	80.6%	73.5%	..	39.2	When the teasing is meant to deliver a hurtful message
17	22.7%	8	9	..	25.8%	26.5%	..	40.1	When the teasing is meant to deliver a subliminal message.
50	66.7%	23	27	..	74.2%	79.4%	..	39.4	When the teasing is not stopped, even after asked.
22	29.3%	13	9	..	41.9%	26.5%	..	38.5	When the recipient of the teasing perceives an insult and is hurt.
7	9.3%	3	4	..	9.7%	11.8%	..	37.8	Teasing and abuse are separate issues and should not be confused.
41	54.7%	21	20	..	67.7%	58.8%	..	39.7	Teasing can be a form of verbal abuse, but it would be a generalization to say that all teasing is abuse.
2	2.7%	1	1	..	3.2%	2.9%	..	..	I have other thoughts on this survey.

Rating Total Female Male Unspecified Average Age
Good 21 11 10 0 38.7
Bad 3 0 3 0 32.2
No Opinion 48 25 23 0 39.7

Rating	Total	Female	Male	Average Age
Good	21	11	10	38.7
Bad	3	0	3	32.2
No Opinion	48	25	23	39.7

Type Number
Abstainers 10
Male 34
Female 31
Unspecified 0

Last	Type	Created	Category	Creator	Sort	Votes	Hides	Rating
Last	multiple	20-Apr-1999	opinion	Pooh_Bear	unsorted	75	8	62.5%