You can make this claim about any group, minority or not. Every single group of people has bad apples and some groups are even 51%+ bad but trying to use anecdotal evidence from twitter as proof is really not great.
Additionally using epithets and dehumanization of any group no matter what they've done is a road to more hate and violence and will never resolve anything. I find it pretty ironic that some on the left are ok with insults and dehumanization as long as it's of the right group of people that they've deemed "undesirable" even if that group of people really should stop what they're doing, using insults and animal comparisons is a road that takes you right back to what they claim to be fighting.
This got kinda long winded and preachy...
tl;dr calling cops "pigs" is a slur like any other and will only cause more problems.
my brother is a pig and he has no problem being called that. He is also suffering from depression because 9/10 of his colleagues are literal Nazis in a uniform and openly admit that they vote far-right (in my place that is the people who still use the Nazi salute until today). They not only hate just foreigners but are constantly abusing their power.
The other pigs I met were happy to take bribes and one (in Ireland) even bragged about how much he loved to use his pepper spray every time he gets a chance (he rarely does).
fwiw, pigs in colloquial english is not just a slur but silly slang, unless you are bold enough to call a whole class of blue-collar people (who hate pigs) problematic. Maybe read Orwell (Animal Farm) or the later Irvine Welsh https://en.wikipedia.org/wiki/Filth_(novel)
Never ever trust a uniform whatever country you're in. Btw I also do consulting for LE and the "sane" ones usually don't deny that they have a problem with racism. I'm not even talking about the videos from China where people get beaten with sticks or dogs get clubbed to death by men in blue while their colleagues are laughing before they move on to terrifying citizens.
I don't think getting upset about what is "natural language" in blue collar surrounding is going to do any good. I know the pigs are OK with it. (watch out for those who are not though)
Additionally using epithets and dehumanization of any group no matter what they've done is a road to more hate and violence and will never resolve anything. I find it pretty ironic that some on the left are ok with insults and dehumanization as long as it's of the right group of people that they've deemed "undesirable" even if that group of people really should stop what they're doing, using insults and animal comparisons is a road that takes you right back to what they claim to be fighting.
This got kinda long winded and preachy...
tl;dr calling cops "pigs" is a slur like any other and will only cause more problems.