This site is American and refers to American English, not the English we speak here, so words like 'jip' over here have a different origin and different meaning and no connection with gypsies, even the spelling is different. I would have talked about having a jippy leg when I sprained my ankle badly. Other words on the list are clearly solely American and are not in general use in the UK.
As for Paddywagon, speaking as a member of the Irish diaspora, I have no problems with that at all. The Irish have, in the past, had a reputation for being riotous and heavy drinkers, so police wagons in the states probably were full of Irishmen on a Saturday night.
They were in London. My Irish grandmother and the parish priest in Bermondsey at the time, spent a lot of time at the local police station. negotiating the release of young Irish boys and men who had drink taken, as the phrase goes. This would have been between 1910-1930.
Stereotypes always have some basis on fact. We talk about giggling school girls. I have a 14 year old DGD, and that is the perfect description of her and her friends and most girls I have known at that age. It is the stage she is going through. school girls are not stereotyped as rugby playing, because very few do or have done in the past.
Stereotypes go out of date, and will only ever apply to a proportion of any group, but as far as I am concerned