There are several reasons for this:
* for liberals, what feels good is good and what feels bad is bad, so screaming and crying is considered to make you the more moral person in the argument - in short, whoever freaks out first wins
* liberals give the greatest moral weight to those who are offended/upset, and you get that by throwing the biggest dramatic act
* the most outraged/upset person gets the reflexive sympathy of liberals in the room, so you MUST be melodramatic to gain social support - and in numbers, they are more likely to win an confrontation
* by using visible expressions of emotion as a measure of sincerity and morality, liberals have destroyed the ability to have a rational discussion, so too many young people’s bargaining pattern is “I don’t like it/don’t want to ... name calling ... hysterics”
* the catering to the tantrum leads to deliberate use of them to force issues/submission of others even when the person is not actually annoyed
Well, if they are really good, they can always apply for an acting job.