I can't imagine why anyone would be angry.
But I often "bash" wing chun as a "martial art." It's just not very effective against an athletic, competent fighter.
But I have no hatred for wing chun practitioner's, that would just be silly and misplaced.
However, I am quite annoyed with instructors who charge money for Wing Chun as a form of Self-Defense.
It isn't, and that's fraud if they accept money for it.
Oh god, the hatred has found me!!! Seriously though, you've got to define your terms. For me, MMA isn't self defense, it's all out fighting--with or without rules, depending on the venue. Self-defense is an old lady using pepper-spray on a mugger, then kicking him hard in the ...er...cojones! And, regarding Wing Chun/Tsun, after working a few times with Emin Boztepe, I can say that it can be very effective within its range. Sure it has limitations...but then what doesn't?