How do you know that re: this campaign?
I think everyone is aware that M&S has used healthy models in the past but the comment is made about this campaign. As for being offended, what part of that poster's comment made you think he was "offended"? You seem to be more "offended" yourself, you've thrown in a silly emoji even as a sign of contempt but are still ironically complaining about others being offended.
Did you see the bit where I wrote
it wasn't necessarily aimed at that poster. He does like to get outraged by what he thinking is wokeism though.