Is it wrong to judge how people behaved in the past based on today's morals?

Yes.  Again, the idea is that kls responded to me with the old "Who are you to tell me what I have to accept/what I can do/etc."  The fact is that she's often fine with other people telling her what she has to accept/what she can do.  If she weren't fine with that, then she'd basically be pro anarchy/against any basic rules to follow as you put it.

Or in other words, "Who are you to tell me what I have to accept/what I can do/etc." doesn't work as an objection unless we're talking to someone who is an anarchist.