Fat and Stupid?

I get a lot of spam, usually I don't pay much attention to it and most of it gets auto-filtered by Thunderbird but one this week caught my eye:

you have pissed of being obese, or not being able to fit into your clothes

Now, bad grammar aside this strikes me as being particularly derogatory - not only implying I'm obese (and, to be fair, there's more than an element of truth in that) but also that I'm too stupid to realise it and keep buying clothes that don't fit me. Why would I do that? Mind you, if I was stupid enough to be doing that I might also be stupid enough to click on the link in the email...