WolferIt gives people encouragement. They appreciate those sorts of posts more than votes with no post at all, especially since votes don't actually do anything right now, and haven't done for at least 6 months... lol!
I don't see the point in posting something like 'hahaha, I liked that'
Still, it's the thought that counts.
If you look at a comic and never post anything, well they'll never know you read them... Better to let them know sometimes. Posts really give people a reason to keep going so that they know they're not just putting their art up for an audience of 3 people.
Never tell someone that you find their work offensive. that indicates low intelligence: an intelligent person knows there's LOTS of stuff on the web that will offend them and they learn to avoid it. An intelligent reaction to finding something that offends you is to leave that web page and not go back there again.