Because it was a joke. I wasn't aware of any FReeper provision that you have to PING someone when you post graphics or icons, just if you mention their name specifically.
I begin to suspect you're being deliberately obtuse, in a trollish kind of way.
You're being petty, Petronski. And childish. And the other word in post #42 that was deleted.
You claimed you were making a joke to me. But the offending post did not ping me. Therefore it is easy to conclude your claim is a weak afterthought having no basis in your original intent.