He's right, it is a generalization. What I've realized is that they're playing something very similar to the race card. What they're trying to imply, as a form of ad hominem attack designed to discredit the arguer, is that generalization must mean the person is speaking about all cops, which must mean they're bigoted, which must mean their opinion is merely a product of prejudice.
But it doesn't work that way. There's nothing wrong with generalizations in and of themselves. They may be right, and they may be wrong. The only time a generalization becomes prima facie invalid is when it is phrased in such a way as to apply to all members of a group.
Let's consider a few examples, shall we?
Generalizations without merit:
• Black people are criminals.
• Southern conservatives are racist, xenophobic KKK members.
• It is always cold when it is rainy.
• Gun owners are law-abiding.
• Cops are evil.
Generalizations which do not purport to apply to every member of the group, and which may have merit:
• Black folks commit more violent crimes than while folks.
• Most conservatives oppose gun control.
• It is generally chilly when it rains.
• The average gun owner is law-abiding.
• The average cop will cover for the "bad apples" in their ranks.
I agree it is a generalization and why I left it out of my reply. Good post. In a rant that became sort of an essay/op-ed (There is no bad apple) I stated whether we like it or not stereotypes exist, e.g. all engineers I know are type A personalities, I wouldn't want someone without attention to detail engineering a bridge.
To me their argument of generalizing "gun owner" and generalizing "cops" in the way they are doing it does not equate.
Cops voluntarily, sign up to join a group of government minions in using force upon civilians, they are supposed to be constitutionally restricted, this system is known to have these problems, these apples choose to be part of the barrel.
Gun owners are individuals exercising a fundamental right, who have no connection with other "gun owners" any more than one person with fingers has any association than another person with fingers.
I can and do separate my feelings for individual cops over the whole group or system. I know a few good cops. I know even more ex cops who are willing to expose the prevailing attitude with in those who are still in the system.
That being said the cop in the OP, well.....fits the generalization/stereotype....