SlateStarCodex had a good article on this. Basically, if you keep on complaining about bad <X> people then <X> people are going to start worrying that you are targeting them because you are referring to <X> people when you could just complain about bad people.
This can also cause strife between well meaning people who wouldn't otherwise be at each others throats. Like you have someone complaining about bad <X> people, an <X> person gets triggered and lashes out, the original complainer now believes the triggered person is a bad <X> person.
This can also cause strife between well meaning people who wouldn't otherwise be at each others throats. Like you have someone complaining about bad <X> people, an <X> person gets triggered and lashes out, the original complainer now believes the triggered person is a bad <X> person.