I think a co-worker was way out of line, but am not sure if I started it. Would you sanity check this situation?

The guy and his wife made over their daughter's bedroom when she turned 13 as a surprise. An aquarium theme: painted it blue, had a lot of fish designs stencilled on the walls, a big fish pillow, lots of details that didn't really stick with me. Frankly, it didn't appeal to me at all and I wasn't sure how someone would react to having their room redone as a surprise -- I was appalled, but wanted to be polite. (I'd never heard of those TV shows that do this at that time.) Since he'd put a lot of work into it and was expecting some kind of response, I tried to sound enthusiastic and said that I bet my cats would enjoy seeing it. (I know, incredibly lame. I don't do social all that well...) His response was he'd like for me to bring my bl***y cats over so he could sic his dog on them and watch him rip them to shreads. I've been avoiding this coworker ever since. (We are in different buildings and rarely interface.) He has noticed that I'm avoiding him, but seems to have no clue why I'm annoyed. Okay, my remark was inane, but I thought his response was really out of line. Comments anybody?