Years ago I was mass-flamed on an old style BBS system for pointing out that one class of people indulge in a dusgusting habit, wreck their health, raise insurance premiums and healthcare costs for everyone else, etc..
It was an antismoking forum and at the end, I let it be known I was referring to Hugely fat people. The tantrums and shrieking had to be seen to be believed.
It's similar, and the arguments can be extended to other things like drug addiction or chasing AIDS in bathhouses.
The problem then becomes Anti-Fat Mcdonalds's suites, etc.