People can make comments about anything, which is great. Some people accept being offended a little isn't a bad thing. People will defend their views on immigrants, the BNP, label people as chavs or 'scrounging scum' and even say some people deserve the death sentence.
The one people who you can't discuss are the overweight. You can't suggest they're lazy or unattractive even in your own opinion. Isn't that just strange?