I do not think not saying Loshon Hara is more important then some other things, is any kind of “personal attack” on anyone.
I think it is discussing the issue in many cases.
Most threads where not following a certain halacha (whatever halacha is brought up in each particualr thread) , is brought up
the underlying problem is that it brings down the level of Yiddishkeit in any community where it happens.
Loshon Hara will do that, far faster and more insidiously, then just about anything else.
Lets say for example; Someone is talking about achdus and why there may not be as much of it as there should.
One of the biggest and most obvious reasons is because of Loshion Hara.
And the effects of it get very personal, if someone loses a job or shidduch from it, of course it’s extremly personal.
But bringing it up is not necessarily “an attack” on anyone.
It is just brought up as part of the discussion.