No, you've decided to take it as an insult. You demand grace from them and give none in return. It's more a reflection on you than it is on them.
I hope you never encounter the blinding pain of sudden, devastating grief, and you never have to find out just how impossible it is to try to rise above anything in that moment, to choose anything in that moment.
You're not even sure your heart is going to remember how to beat because the world as you thought you understood it has just come to a screeching halt. The prospect that the next moment has the audacity to happen, and the one after that--that there's still a world at all now that this person isn't in it--doesn't even make sense.
And somebody on the internet is still going to tell you they know how you feel and you shouldn't choose to take their ignorant platitudes as insensitive.
It tells me everything I need to know that you still think it might be the right course to say this to someone anyway.
But you know what that somebody on the internet has and has not felt, right?
I can't explain it to you.
But yes. There is a profound difference between people who know and people who don't, and it's only people who don't who think the difference might be missable.
I can't say what someone has felt, but I can be absolutely certain what someone hasn't.
There may be somebody on the internet who knows then.