Probably council housing or housing association tenants. My guess is that the person who said "rent stabilised" is American, as it is an American term - I know new yorkers in rent stabilised housing.
One of the many problems with the internet is the export of American culture.
Given the time of day it’s likely OP was just repeating YouTube talking points from outrage bait videos, rather than being an actual American, but the infection remains regardless, the whole “hands up don’t shoot” nonsense where people in the U.K. acted like the police were armed for example
The following is not a class bound remark: some people don't have culture, so they absorb americanisms more easily. Hands down, worst bit of the Internet is that it provides those americanisms.
Given the time of day it’s likely OP was just repeating YouTube talking points from outrage bait videos, rather than being an actual American, but the infection remains regardless, the whole “hands up don’t shoot” nonsense where people in the U.K. acted like the police were armed for example