Offends... let's see, there are just so many things....
MowMow, he gets *SO* pissed when I touch him after my morning shower/lotion. I'm all stinky and I reach for him and he sidesteps away every time. If I *DO* touch him, he lays his ears sideways and stares at me with his eyes dilated.
Neelix is hard to offend. I guess the only thing that really bothers him (it usually only happens when I think he's Book at first glance). Is touch the tip of his tail. The other two when they walk by with their tails up, I reach down and rub the tip of their tail between my thump and forefinger very very gently. MowMow always chirps at me and Book flops over for me to rub his belly with my foot. Neelix... he whips around every time and WHOMPS me on the hand with his ears back. If I repeat it, he'll go after me with nails. I don't know if his tail is just more sensitive or if he just hates it but WOW, it pisses him off. Like I said, I don't do it to him often and if I do it's by mistake but WOW he reacts violently.
Book hates mommy kisses. He is convinced they are corrosive. If I pick him up and give him kisses he squeezes his eyes shut, leans back as far as he can, and gives plaintive REORS. When I put him down he rolls around begging for more attention but if I pick him for more kisses he does the same thing.
Toothpaste too, they ALL sit on the sink and watch me brush my teeth but heaven forbid I hold out the toothbrush for anyone to sniff. THey all back up and make faces at me.