Well,
SecretMethod said it far better than I could.
But I can't keep my trap shut, so I always have to add a few things
To me, "bashing" is like walking into your friend's or their friend's house and saying "gee, this place sucks, your furniture is crappy, it smells, your mom sucks.....oh, what's for dinner?".
In other words, it's the things that you DON'T say when in someone's house (Halx's in this case) and want to be invited back.
And as SecretMethod said, there are two ways to say everything. You can tell us, "You know, I really don't agree with this policy" and nothing bad will happen (the policy may or may not change, but that's another kettle of fish). But if you come in here and make posts like, "The mods and admins around here are power hungry Nazi's" (just a hypothetical example), then don't be surprised if you try to login and can't.
Politeness and mutual respect, I really don't know how much simpler it can get.